Mike Penz

patent. A prior-art search for your code ideas — has this dev tool already been shipped?

Poseidon. Control which servers your Android app's SDKs are allowed to reach — with simple rules in your manifest. No VPN, no root.

kempt. A pre-commit-friendly multi-language source formatter

DrawBox. Kotlin Multiplatform drawing library with SVG export, undo/redo & shapes for Android, iOS, Web & Desktop.

agsl-tools. Dynamic preview of AGSL shaders in Android Studio.

hydra. A Gradle-plugin RASP for Android — dynamically bake root/hooking/cloning/integrity checks into any APK at build time.

vibrance. Natural color mixing for Kotlin and Compose Multiplatform.

sqlx4k. A coroutine-first SQL toolkit with compile-time query validations for Kotlin Multiplatform. PostgreSQL, MySQL/MariaDB, and SQLite supported.

sentinel. Sentinel is a modular Kotlin Multiplatform security toolkit designed to analyze operating environments and detect potential security threats in real time.

KSafe. A library for saving key/value pair data for Kotlin Multiplatform and Android. Encryption enabled by default, with option for Plain (unencrypted) storage. Supports Property Delegates, Flow/StateFlow, with Jetpack Compose and biometrics integration using hardware-backed encryption.

navigation3-browser. A tiny library to integrate Androidx.Navigation3 with Browser History!

spectre. Programmatically drive your real Compose UI on the desktop.

skills. Skills for Kotlin, Jetpack Compose, and Android development

compose-ai-tools. Helping the Agents Compose the Things

sceneview. 3D & AR SDK for Android (Jetpack Compose + Filament), iOS (SwiftUI + RealityKit), and Web. AI-first: llms.txt, MCP server, Copilot/Cursor rules. The only Compose-native 3D library.

RikkaUi. RikkaUI — composing elements into harmony. Shadcn/UI Inspired component library & design system for Jetpack Compose.

cryptography-kotlin. A cryptography/crypto library for Kotlin Multiplatform

meshoptimizer. Mesh optimization library that makes meshes smaller and faster to render

FuzzyKot. Fuzzy string matching for Kotlin Multiplatform.

svg-to-compose. Convert SVG and Android Vector Drawables (XML) into Jetpack Compose ImageVector code. CLI, Gradle plugin, and online playground. Kotlin Multiplatform supported.

kstats. Kotlin Multiplatform statistics library: distributions, hypothesis tests, correlation, descriptive stats, and sampling

tracey. A flight recorder for your Compose app — catch every interaction before the crash.

dejavu. A lightweight framework for tracking and asserting against Jetpack Compose recompositions.

zerobyte. Backup automation for self-hosters. Built on top of restic

Nucleus. Nucleus is the native desktop platform for the JVM. Combined with Compose Multiplatform, it forms the most complete, most performant, and most deeply integrated desktop application stack ever built — on any language, any runtime, any platform.

avdbuddy. AvdBuddy is a native macOS app for managing Android Virtual Devices without going through Android Studio.

Cranpose. Cranpose is a Jetpack Compose-inspired declarative Rust UI framework. https://crates.io/crates/cranpose

A2UI-Android. 🚀 Production-ready Android Jetpack Compose renderer for A2UI Protocol. Let AI agents dynamically generate beautiful, interactive native Android UIs with 20+ components, smart data binding, validation, and full accessibility support. Android 5.0+ compatible.

reBot-DevArm. Open Source Robotic Arm for All Developers

gitbutler. The GitButler version control client, backed by Git, powered by Tauri/Rust/Svelte

KSensor. Live Sensors/States data from Android & iOS targets

Grant. Kotlin Multiplatform permission library for Android & iOS. No Fragment/Activity needed, ViewModel-first, Compose Multiplatform ready. Fixes Android dead clicks & iOS deadlocks.

otel-desktop-viewer. otel-desktop-viewer is a CLI tool for receiving OpenTelemetry traces while working on your local machine.

gradle-msix-plugin. Gradle plugin to create MSIX package

ksrc. Let your AI agents search and read 3rd-party Kotlin dependency sources

StateMachine. A simple, yet powerful, State Machine to manage UI complex UI states, written in Kotlin for multiplatform usage!

kmp-resilient. A Kotlin Multiplatform library providing resilience patterns (Timeout, Retry, Circuit Breaker, Rate Limiter, Bulkhead, Hedging, Cache, Fallback) for suspend functions. Compose them declaratively with a small DSL and observe runtime telemetry via Flow.

JetOverlay. A lightweight, Compose-first Android Overlay SDK. Features physics-based dragging, isolated Lifecycle/ViewModel scopes, and Foreground Service persistence (Kotlin, Jetpack Compose, WindowManager, Android Service).

PixelPlanets. GDScript

shadow-pointer. Rendering high-quality shadow from the user's finger

tapmoc. 🔙 Tapmoc helps with your backward compat

kable. Kotlin Asynchronous Bluetooth Low-Energy

compose-material-data-table. A Kotlin Multiplatform and Compose Multiplatform implementation of the Material 2 Data Table

kmp-wheel-picker. Provides a modular wheel picker for Compose Multiplatform.

mediabunny. Pure TypeScript media toolkit for reading, writing, and converting video and audio files, directly in the browser.

markitdown. Python tool for converting files and office documents to Markdown.

VERT. The next-generation file converter. Open source, fully local* and free forever.

compose-keyhandler. A key handler library for compose multiplatform/KMP

kubriko. A game engine based on Compose Multiplatform for 2D Android, iOS, Desktop, and Web projects.

kotlin-desktop-toolkit. Kotlin

Knee. Seamless two-way communication between Kotlin/Native and Kotlin/JVM. Supports suspend functions, classes, interfaces, no-copy buffers and much more.

Kubit. Micro-optimized, fast, memory-efficient Kotlin utilities.

storyboard. Library for building presentations using Compose Multiplatform.

app-privacy-policy-generator. Generate a customized Privacy Policy and Terms of Use document for your mobile apps

alarmee. A Kotlin/Compose Multiplatform library to schedule alarms, display local notifications, and handle push notifications on Android and iOS.

figx. Pragmatic CLI tool for importing design assets from Figma into your codebase.

animate-compose. Build and copy compose animations

NLWeb. Main reference implementation for NLWeb, implemented in Python.

vexa. Open-source meeting transcription API for Google Meet, Microsoft Teams & Zoom. Auto-join bots, real-time WebSocket transcripts, MCP server for AI agents. Self-host or use hosted SaaS.

mcp-jetbrains. A model context protocol server to work with JetBrains IDEs: IntelliJ, PyCharm, WebStorm, etc. Also, works with Android Studio

maplibre-compose. Add interactive vector tile maps to your Compose app

dia. A TTS model capable of generating ultra-realistic dialogue in one pass.

mosaic. Build terminal UI in Kotlin using Jetpack Compose

gobley. Embed Rust into your Kotlin Multiplatform project

metro. A multiplatform, compile-time dependency injection framework for Kotlin

croc. Easily and securely send things from one computer to another :crocodile: :package:

gadulka. A minimalistic audio player library for Kotlin Multiplatform and Compose Multiplatform

heron. A graceful multiplatform bluesky client

jetpack-camera-app. A CameraX/Compose camera app built for validating camera feature implementations, serving as a reference for developers and OEMs.

Racer. C

secrets-vault-plugin. 🛡️ Android Gradle plugin for enhanced secret management and protection. Keep app secrets secure and organized.

minesweeper-with-compose. Built with Junie: Minesweeper game in Compose Multiplatform

KtorMonitor. Powerful tool to monitor Ktor Client, OkHttp and http4k requests and responses, making it easier to debug and analyze network communication.

goose. an open source, extensible AI agent that goes beyond code suggestions - install, execute, edit, and test with any LLM

charty. Weave data into enchanting Jetpack Compose graphs—no potions required! 📜🔮

kanalytics. Kotlin Multiplatform Analytics with a debug viewer

shadow. Gradle plugin to create fat/uber JARs, apply file transforms, and relocate packages for applications and libraries. Gradle version of Maven's Shade plugin.

aspecto. Aspect-Perfect Grid for Jetpack Compose / Compose Multiplatform: Achieve precise aspect ratios and seamless layout consistency.

Restrikt. Lightweight compiler plugin intended for Kotlin/JVM library development and symbol visibility control.

mixbox. Mixbox is a library for natural color mixing based on real pigments.

mitmproxy2swagger. Automagically reverse-engineer REST APIs via capturing traffic

pinata-android. The Pinata Android library provides convenient access to the Pinata API from your Android/Kotlin applications.

LGWebOSRemote. Command line webOS remote for LGTVs

kstatemachine. A powerful Kotlin Multiplatform state machine library with clean DSL syntax and first-class Kotlin Coroutines support

kotlin-sdk. The official Kotlin SDK for Model Context Protocol servers and clients. Maintained in collaboration with JetBrains

signum. Kotlin Multiplatform Crypto/PKI/ASN.1 Library with Attestation and Hardware-Backed Crypto Support on Mobile

KMPDevicePreview. Kotlin & Compose Multiplatform library to simulate any device from any platform, supporting Android, iOS, JVM, JS, and WebAssembly

KonanPlugin. Gradle plugin for compiling C source files to static libraries for all targets supported by Kotlin Multiplatform

vanir. Vanir is a source code-based static analysis tool that automatically identifies the list of missing security patches in the target system. By default, Vanir pulls up-to-date CVEs from Open Source Vulnerabilities (OSV) together with their corresponding signatures so that users can transparently scan missing patches for an up-to-date list of CVEs.

bees-and-bombs-compose. Implementing some cool animations using Jetpack Compose

constraints-explorer. A lightweight tool to help understand and debug how Compose's layout constraints affect your composables.

gr8. Gr8 = Gradle + R8. It makes it easy to relocate, shrink and obfuscate your jars.

compose-hot-reload. Compose Hot Reload: Make changes to your UI code in a Compose Multiplatform application, and see the results in real time. No restarts required. Compose Hot Reload runs your application on the JetBrains Runtime and intelligently reloads your code whenever it is changed.

gradle-recipes. Ready-to-use recipes for common build customizations that showcase the Android Gradle plugin's public APIs and DSL.

JsonTree. A Compose Multiplatform library for pretty Json in Compose

Rin. Enhance Compose Multiplatform with "rememberRetained{}", inspired by Circuit. Successfully used in DroidKaigi 2024 app with no issues. Improve state management using Compose! 🔄✨

mordant. Multiplatform text styling for Kotlin command-line applications

lets-plot-compose. Compose frontend for Lets-Plot multiplatform plotting library.

Krop. Kotlin multiplatform library for cropping image(Compose Multiplatform) by building on top of coil. Could used in target of Android, iOS, web, desktop. Easy to use and customize.

kopy. Nested copies made easy in Kotlin

sherlock. Hunt down social media accounts by username across social networks

multibase. 100% Kotlin Multiplatform Multibase Encoder/Decoder

alien. ALIEN is a CUDA-powered artificial life simulation program.

Storytale. Kotlin

json-schema-validator. The JSON schema validation library that works with https://github.com/Kotlin/kotlinx.serialization

bytemask. Android Gradle Plugin that masks secret strings for the app in the source code making it difficult to extract from reverse engineering.

sdp-ssp-compose-multiplatform. Kotlin

ComposeCharts. Animated & Flexible Practical Charts For Jetpack Compose

Jetpack-Compose-Tables. 🐝 A Compose UI data table library which allows developers to seamless integrate visually appealing and customizable tables to their Android apps or IOS apps.

sonatype-publish-fix. A Gradle Plugin that prevents parallel publishing to maven repositories.

mistral-ai-kmp. Mistral AI SDK for Kotlin Multiplatform (KMP) with support for Android, iOS, Desktop and Wasm. Sample projects to show the Mistral AI capabilities.

charts. 🟢 Charts for Jetpack Compose — Multiplatform (Android · iOS · Web · Desktop)

MaterialKolor. 🎨 Generate a dynamic Material3 color scheme from a seed color

ComposeOClock. Draw Wear OS Watch Faces with Compose Canvas (& runtime)

gratatouille. Cook yourself delicious Gradle plugins 🐘🤝🐭👉🧑‍🍳

nmcp. Publish your libraries to the Central Portal 📦

colormath. Multiplatform Kotlin color conversion and manipulation

AndroidMediaPipe. Some examples with MediaPipe

deprecated-generative-ai-android. This SDK is now deprecated, use the unified Firebase SDK.

GeminiKMP. Kotlin Multiplatform sample that uses Gemini Generative AI APIs. Runs on Android, iOS, Desktop and Wasm based Compose for Web.

llama2-kmp. Port of Andrej Karpathy's llama2.c to Kotlin Multiplatform.

ResChiper. AAB Resource Obfuscation Tool for Android

byte-size. Kotlin multiplatform units for representing SI and IEC bytes and bits, inspired by jakewharton/byteunits and kotlin.time.Duration

haze. Background blurring for Compose Multiplatform / Jetpack Compose

ollama. Get up and running with Kimi-K2.6, GLM-5.1, MiniMax, DeepSeek, gpt-oss, Qwen, Gemma and other models.

Google-Direction-Api. Direction Api In Android Google Map. This is an android library which provides you a direction path between two points (locations) such as device location to destination location. To use this library, you need to create a project on Goolge Cloud Console and enabble the Map SDK along with Google Direction Api.

konsist. Konsist is a powerful static code analyzer tailored for Kotlin, focused on ensuring codebase consistency and adherence to coding conventions.

kotlinx-io. Kotlin multiplatform I/O library

vuda. VUDA is a header-only library based on Vulkan that provides a CUDA Runtime API interface for writing GPU-accelerated applications.

vertexai-kt. VertexAI-KT is a Kotlin multiplatform library that simplifies integration with Google Cloud's Vertex AI PaLM API for generative model creation and training.

kapshot. Kotlin Compiler Plugin for source capture

kim. Image metadata manipulation library for Kotlin Multiplatform

fyusenet. FyuseNet is an OpenGL(ES) based library that allows to run neural network inference on GPUs that support OpenGL or OpenGL/ES, which is the case for most desktop and mobile GPUs on the market.

git-delete-merged-branches. :fire: Command-line tool to delete merged Git branches

redwood. Multiplatform reactive UI for Android, iOS, and web using Kotlin and Jetpack Compose

clikt. Multiplatform command line interface parsing for Kotlin

kmp-framework-bundler. A Gradle plugin for Kotlin Multiplatform projects that generate a XCFramework for Apple targets or a FatFramework for iOS targets, and manages the publishing process in a CocoaPod Repository.

vico. A powerful and extensible chart library for Compose Multiplatform.

release-changelog-builder-action. A GitHub action that builds your release notes / changelog fast, easy and exactly the way you want.

gradle-dependency-submission. Calculates dependencies for a Gradle build-target and submits the list to the Dependency Submission API

runtipi. Runtipi is a homeserver for everyone! One command setup, one click installs for your favorites self-hosted apps. ✨

kotter. A declarative, Kotlin-idiomatic API for writing dynamic console applications.

nowinandroid. A fully functional Android app built entirely with Kotlin and Jetpack Compose

AboutLibraries. AboutLibraries automatically collects all dependencies and licenses of any gradle project (Kotlin MultiPlatform), and provides easy to integrate UI components for Android and Compose Multiplatform environments

multiplatform-markdown-renderer. Markdown renderer for Kotlin Multiplatform Projects (Android, iOS, Desktop), using Compose.

xray-action. ... a GitHub action to import test results into "Xray" - A complete Test Management tool for Jira.

sliding-pane-layout. SlidingPaneLayout that is partially visible, with cross fade.

action-junit-report. Reports junit test results as GitHub Pull Request Check

constraintlayout. ConstraintLayout is an Android layout component which allows you to position and size widgets in a flexible way

androidx. Development environment for Android Jetpack extension libraries under the androidx namespace. Synchronized with Android Jetpack's primary development branch on AOSP.

adam. Adam (or adm) is a coroutine-friendly Android Debug Bridge client written in Kotlin

FloorPlan. Render database schemas into ER diagrams

binary-compatibility-validator. Public API management tool

marathon. Cross-platform test runner

press. Cross-platform markdown editor written in Kotlin Multiplatform (work in progress)

diffuse. Diffuse is a tool for diffing APKs, AABs, AARs, and JARs

android-emulator-container-scripts. This is a set of minimal scripts to run the emulator in a container for various systems such as Docker, for external consumption

insetter. Insetter is a library to help apps handle WindowInsets more easily

coil. Image loading for Android and Compose Multiplatform.

MaterialDrawer. The flexible, easy to use, all in one drawer library for your Android project. Now brand new with material 2 design.

bundletool. Bundletool is a command-line tool to manipulate Android App Bundles

platform_frameworks_support. Java

vergeml. Machine Learning Environment - alpha version

tape. A lightning fast, transactional, file-based FIFO for Android and Java.

avocado. 🥑 Vector Drawable optimization tool 🥑

Isometric. Isometric drawing library for Android

ExpectAnim. Describe your animation and run !

sensey. :zap: [Android Library] Play with sensor events & detect gestures in a breeze.

material-components-android. [MAINTENANCE MODE] Modular and customizable Material Design UI components for Android

dexcount-gradle-plugin. A Gradle plugin to report the number of method references in your APK on every build.

debug-bottle. 🍼Debug Bottle is an Android runtime debug / develop tools written using kotlin language.

Floppy. Fast object key value storage for Java with much support for Android

drag-select-recyclerview. 👇 Easy Google Photos style multi-selection for RecyclerViews, powered by Kotlin and AndroidX.

caffeine. A high performance caching library for Java

FastLayout. Generates a Java Object for your xml layout to reduce inflate time to zero

uCrop. Image Cropping Library for Android

sqlbrite. A lightweight wrapper around SQLiteOpenHelper which introduces reactive stream semantics to SQL operations.

retrofit. A type-safe HTTP client for Android and the JVM

plaid. An Android app which provides design news & inspiration as well as being an example of implementing material design.

immutables. Java annotation processor to create immutable objects and builders, for records too. Sweep boilerplate code under the rug!

u2020. A sample Android app which showcases advanced usage of Dagger among other open source libraries.

ohmyzsh. 🙃 A delightful community-driven (with 2,500+ contributors) framework for managing your zsh configuration. Includes 300+ optional plugins (rails, git, macOS, hub, docker, homebrew, node, php, python, etc), 140+ themes to spice up your morning, and an auto-update tool that makes it easy to keep up with the latest updates from the community.

leakcanary. A memory leak detection library for Android.

gradle-versions-plugin. Gradle plugin to discover dependency updates

material-dialogs. 😍 A beautiful, fluid, and extensible dialogs API for Kotlin & Android.

guava. Google core libraries for Java

MPAndroidChart. A powerful 🚀 Android chart view / graph view library, supporting line- bar- pie- radar- bubble- and candlestick charts as well as scaling, panning and animations.

okio. A modern I/O library for Android, Java, and Kotlin Multiplatform.

muzei. Muzei Live Wallpaper for Android

phrase. Phrase is an Android string resource templating library

dagger. A fast dependency injector for Android and Java.

okhttp. Square’s meticulous HTTP client for the JVM, Android, and GraalVM.

PhotoView. Implementation of ImageView for Android that supports zooming, by various touch gestures.

otto. An enhanced Guava-based event bus with emphasis on Android support.