Jonatan Ivanov

pure-bash-bible. 📖 A collection of pure bash alternatives to external processes.

javaconferences.github.io. The Github repository for javaconferences.org

skyhopper. JavaScript

macchanger.  Change your mac address, for macOS

paywall_bypass_bookmarklets. One click to bypass a paywall. Two at most.

spring-doc-check. TypeScript

financial. Repository containing financial spreadsheets

system-design-101. Explain complex systems using visuals and simple terms. Help you prepare for system design interviews.

foundation. The Commonhaus Foundation fosters a nurturing home for open-source projects, prioritizing innovation, collaboration, and sustainability.

little-rat. 🐀 Small chrome extension to monitor (and optionally block) other extensions' network calls

yolo. Life's too short for running tests

mcs. Search the Maven Central Repository from your command line!

jc. CLI tool and python library that converts the output of popular command-line tools, file-types, and common strings to JSON, YAML, or Dictionaries. This allows piping of output to tools like jq and simplifying automation scripts.

javabubble. Backup list for my friendly Java bubble

datasource-proxy. Provide listener framework for JDBC interactions and query executions via proxy.

datasource-micrometer. Micrometer Observation API instrumentation and Spring Boot 3 Auto-Configuration for JDBC APIs

slack-anti-delete. I patched my Slack client to keep messages that others delete

jvm-explorer. JVM Explorer is a Java desktop application for browsing loaded class files inside locally running Java Virtual Machines.

mainframer. Tool for remote builds. Sync project to remote machine, execute command, sync back.

awesome-hacker-search-engines. A curated list of awesome search engines useful during Penetration testing, Vulnerability assessments, Red/Blue Team operations, Bug Bounty and more

ugit. 🚨️ ugit helps undo git commands. Your damage control git buddy. Undo from 20+ git scenarios.

developers-conferences-agenda. developers.events is a community-driven platform listing developer/tech conferences and Calls for Papers (CFPs) worldwide with a list, a calendar and a map view. It helps organizers, speakers, sponsors & attendees.

system-design-resources. These are the best resources for System Design on the Internet

cheatsheets. Community-sourced cheatsheets

awesome-db-tools. Everything that makes working with databases easier

forgit. :zzz: A utility tool powered by fzf for using git interactively.

napkin-math. Techniques and numbers for estimating system's performance from first-principles

mitmproxy2swagger. Automagically reverse-engineer REST APIs via capturing traffic

Bash-Oneliner. A collection of handy Bash One-Liners and terminal tricks for data processing and Linux system maintenance.

personal-security-checklist. 🔒 A compiled checklist of 300+ tips for protecting digital security and privacy in 2026

xit. A plain-text file format for todos and check lists

spring-cloud-sleuth. Distributed tracing for spring cloud

micrometer. An application observability facade for the most popular observability tools. Think SLF4J, but for observability.

jdoctor. A Java library for designing good error messages

Logout4Shell. Use Log4Shell vulnerability to vaccinate a victim server against Log4Shell

dstp. 🧪 Run common networking tests against any site.

anteon. Anteon (formerly Ddosify): eBPF-based Kubernetes Monitoring and Performance Testing

indriya. JSR 385 - Reference Implementation

masscan. TCP port scanner, spews SYN packets asynchronously, scanning entire Internet in under 5 minutes.

structured-text-tools. A list of command-line tools for manipulating structured text data

kubernetes-best-practices. A cookbook with the best practices to working with kubernetes.

threeten-extra. Provides additional date-time classes that complement those in JDK 8

bashly. Bash command line framework and CLI generator

cats. CATS is a REST API Fuzzer and negative testing tool for OpenAPI endpoints. CATS automatically generates, runs and reports tests with minimum configuration and no coding effort. Tests are self-healing and do not require maintenance.

lkmpg. The Linux Kernel Module Programming Guide (updated for 5.0+ kernels)

ots. 🔐 Share end-to-end encrypted secrets with others via a one-time URL

NvChad. Blazing fast Neovim framework providing solid defaults and a beautiful UI, enhancing your neovim experience.

gctoolkit. Tool for parsing GC logs

script-commands. Script Commands let you tailor Raycast to your needs. Think of them as little productivity boosts throughout your day.

zellij. A terminal workspace with batteries included

slidev. Presentation Slides for Developers

mvn-clean-install. A collection of Maven related memes

the-book-of-secret-knowledge. A collection of inspiring lists, manuals, cheatsheets, blogs, hacks, one-liners, cli/web tools and more.

mechanical_sympathy. Curated list of resources dedicated to hardware and low level design

hhighlighter. A command line tool to highlight terms

spring-observability. Java

hyperfine. A command-line benchmarking tool

procs. A modern replacement for ps written in Rust

glances. Glances an Eye on your system. A top/htop alternative for GNU/Linux, BSD, Mac OS and Windows operating systems.

modern-unix. A collection of modern/faster/saner alternatives to common unix commands.

PENTESTING-BIBLE. articles

tinsalver. Maven Central release helper to keep your private keys private

awesome-privacy. Awesome Privacy - A curated list of services and alternatives that respect your privacy because PRIVACY MATTERS.

awesome-talks. Awesome online talks and screencasts

stack-on-a-budget. A collection of services with great free tiers for developers on a budget. Sponsored by Mockoon, the best mock API tool. https://mockoon.com

spring-petclinic-microservices. Distributed version of Spring Petclinic built with Spring Cloud

spring-cloud-sleuth-samples. Contains isolated samples of Spring Cloud Sleuth

rewrite. Automated mass refactoring of source code.

Valetudo. Cloud replacement for vacuum robots enabling local-only operation

lab-workshop-2. Workshop for May 12 (Day 2)

whereami. Uses WiFi signals :signal_strength: and machine learning to predict where you are

tz. 🌐 A time zone helper

manim. Animation engine for explanatory math videos

docker-services. Dockerfile

awesome-cto. A curated and opinionated list of resources for Chief Technology Officers, with the emphasis on startups

discoapi. The foojay discovery api (discoapi) is made to discover java packages (jre/jdk) from different distributions.

jazzer. Coverage-guided, in-process fuzzing for the JVM

UsTaxes. Tax filing web application

monsoon. Fast HTTP enumerator

toxiproxy. :alarm_clock: :fire: A TCP proxy to simulate network and system conditions for chaos and resiliency testing

DefaultCreds-cheat-sheet. One place for all the default credentials to assist the Blue/Red teamers identifying devices with default password 🛡️

hacktricks. Welcome to the page where you will find each trick/technique/whatever I have learnt in CTFs, real life apps, and reading researches and news.

Resources-for-Beginner-Bug-Bounty-Hunters. A list of resources for those interested in getting started in bug bounties

booknotes. A collection of my book notes on various subjects, mainly computer science

k1s. Lightweight k8s home lab cluster for Raspberry PIs.

diagrams. :art: Diagram as Code for prototyping cloud system architectures

public-apis. A collective list of free APIs

onefuzz. A self-hosted Fuzzing-As-A-Service platform

learning. A log of things I'm learning

awesome-falsehood. 😱 Falsehoods Programmers Believe in

jdk. JDK main-line development https://openjdk.org/projects/jdk

awesome-system-design. A curated list of awesome System Design (A.K.A. Distributed Systems) resources.

Ciphey. ⚡ Automatically decrypt encryptions without knowing the key or cipher, decode encodings, and crack hashes ⚡

awesome-cold-showers. For when people get too hyped up about things

honkit. :book: HonKit is building beautiful books using Markdown - Fork of GitBook

Tiny-XSS-Payloads. A collection of tiny XSS Payloads that can be used in different contexts. https://tinyxss.terjanq.me

police-brutality. Repository containing evidence of police brutality during the 2020 George Floyd protests

stalk. Highly flexible (distributed) trace analysis tool for Jaeger and Zipkin

learngo. ❤️ 1000+ Hand-Crafted Go Examples, Exercises, and Quizzes. 🚀 Learn Go by fixing 1000+ tiny programs.

xxh. 🚀 Bring your favorite shell wherever you go through the ssh. Xonsh shell, fish, zsh, osquery and so on.

web-vitals. Essential metrics for a healthy site.

Evictor. Java library providing a concurrent map that supports timed entry eviction

cnn-explainer. Learning Convolutional Neural Networks with Interactive Visualization.

jib. 🏗 Build container images for your Java applications.

skaffold. Easy and Repeatable Kubernetes Development

kind. Kubernetes IN Docker - local clusters for testing Kubernetes

NETworkManager. A powerful open-source tool for managing networks and troubleshooting network problems!

what-happens-when-k8s. 🤔 What happens when I type kubectl run?

wrk2. A constant throughput, correct latency recording variant of wrk

yavi. Yet Another Validation for Java (A lambda based type safe validation framework)

problem-spring-web. A library for handling Problems in Spring Web MVC

m-cli.  Swiss Army Knife for macOS

archey-osx. An archey script clone for OS X

alacritty. A cross-platform, OpenGL terminal emulator.

we-need-you. ongoing article (or a series, perhaps?) on how to help the wayward developer get into the industry. this is a work-in-progress until otherwise noted. please mind the dust.

broot. A new way to see and navigate directory trees : https://dystroy.org/broot

http-decision-diagram. An activity diagram to describe the resolution of HTTP response status codes, given various headers.

java-buildpack-memory-calculator. Cloud Foundry JVM Memory Calculator

gradle-test-logger-plugin. A Gradle plugin for printing beautiful logs on the console while running tests

BlockHound. Java agent to detect blocking calls from non-blocking threads.

dot.rs. Yet another management tool for dotfiles

DevOps-Guide. DevOps Guide - Development to Production all configurations with basic notes to debug efficiently.

zerocode. zerocode-tdd is a community-developed, free, open-source, outcome-driven automated testing for microservices APIs, Kafka(Data Streams), Databases and Load scenarios. all defined in simple JSON or YAML — with zero coding.

navi. An interactive cheatsheet tool for the command-line

git-blame-someone-else. Blame someone else for your bad code.

taskcat. Test all the CloudFormation things! (with TaskCat)

jsonbox. HTTP-based JSON storage.

scott. Never debug a test again: Detailed failure reports and hassle free assertions for Java tests - Power Asserts for Java

quickperf. QuickPerf is a testing library for Java to quickly evaluate and improve some performance-related properties

big-list-of-naughty-strings. The Big List of Naughty Strings is a list of strings which have a high probability of causing issues when used as user-input data.

exploit-workshop. A step by step workshop to exploit various vulnerabilities in Node.js and Java applications

reverse-interview. Questions to ask the company during your interview

dsvpn. A Dead Simple VPN.

lefthook. Fast and powerful Git hooks manager for any type of projects.

octant. Highly extensible platform for developers to better understand the complexity of Kubernetes clusters.

esphome. ESPHome is a system to control your ESP32, ESP8266, BK72xx, RP2040 by simple yet powerful configuration files and control them remotely through Home Automation systems.

core. :house_with_garden: Open source home automation that puts local control and privacy first.

docs. WebThings Documentation

wperf. A simple HTTP load testing utility with detailed performance metrics.

distsys-class. Class materials for a distributed systems lecture series

interviews. Everything you need to know to get the job.

java-design-patterns. Design patterns implemented in Java

GHLocalApi. (Unofficial) Google Home local API documentation.

reveal-hugo. 📽️ Create rich HTML-based presentations with Hugo and Reveal.js

system-design-interview. System design interview for IT companies

readme-md-generator. 📄 CLI that generates beautiful README.md files

gh-card. :octocat: GitHub Repository Card for Any Web Site

lor-axe. 🪓 a multi-threaded, low-bandwidth HTTP DOS tool

lazydocker. The lazier way to manage everything docker

flasher.js. A GUI tool for flashing the Espruino JavaScript runtime on ESP8266 based boards

yubikey-handbook. A collection of guidelines, use cases and experiments with the Yubikey

YubiKey-Guide. Community guide to using YubiKey for GnuPG and SSH - protect secrets with hardware crypto.

binmark. Markup language and tool for generating binary files

awesome-piracy. A curated list of awesome warez and piracy links

weaponised-XSS-payloads. XSS payloads designed to turn alert(1) into P1

asdf. Extendable version manager with support for Ruby, Node.js, Elixir, Erlang & more

emuto. manipulate JSON files

polaris. Validation of best practices in your Kubernetes clusters

hacker-laws. 🧠 Laws, Theories, Principles and Patterns for developers and technologists.

cage. Develop and deploy complex Docker applications

flagr. Flagr is a feature flagging, A/B testing and dynamic configuration microservice

themer. 🎨 themer takes a set of colors and outputs themes for your apps (editors, terminals, wallpapers, and more).

hub. A command-line tool that makes git easier to use with GitHub.

git-quick-stats. ▁▅▆▃▅ Git quick statistics is a simple and efficient way to access various statistics in git repository.

OpenInTerminal. ✨ Finder Toolbar app for macOS to open the current directory in Terminal, iTerm, Hyper or Alacritty.

mermaid. Generation of diagrams like flowcharts or sequence diagrams from text in a similar manner as markdown

pure. Pretty, minimal and fast ZSH prompt

awesome-stacks. A curated list of tech stacks for building different applications & features

kuard. Demo app for Kubernetes Up and Running book

grokking_algorithms. Code for the book Grokking Algorithms (https://www.amazon.com/dp/1633438538)

Awesome-Design-Tools. The best design tools and plugins for everything 👉

system-design-primer. Learn how to design large-scale systems. Prep for the system design interview. Includes Anki flashcards.

scouter. Scouter is an open source APM (Application Performance Management) tool.

gitignore. A collection of useful .gitignore templates

rheobot. CoffeeScript

awesome-hyper. 🖥 Delightful Hyper plugins, themes, and resources

awesome-devenv. A curated list of awesome tools, resources and workflow tips making an awesome development environment.

terminals-are-sexy. 💥 A curated list of Terminal frameworks, plugins & resources for CLI lovers.

cosmos. World's largest Contributor driven code dataset | Used in Quark Search Engine, @OpenGenus IQ, OpenGenus Visual Project

cleaver. 30-second slideshows for hackers

etcher. Flash OS images to SD cards & USB drives, safely and easily.

og-aws. 📙 Amazon Web Services — a practical guide

bash-guide. A guide to learn bash

coding-interview-university. A complete computer science study plan to become a software engineer.

CyberChef. The Cyber Swiss Army Knife - a web app for encryption, encoding, compression and data analysis

runlike. Given an existing docker container, prints the command line necessary to run a copy of it.

pentestpackage. a package of Pentest scripts I have made or commonly use

Apollo-11. Original Apollo 11 Guidance Computer (AGC) source code for the command and lunar modules.

FizzBuzzEnterpriseEdition. FizzBuzz Enterprise Edition is a no-nonsense implementation of FizzBuzz made by serious businessmen for serious business purposes.

java-algorithms-implementation. Algorithms and Data Structures implemented in Java

the-art-of-command-line. Master the command line, in one page

GCViewer. Fork of tagtraum industries' GCViewer. Tagtraum stopped development in 2008, I aim to improve support for Sun's / Oracle's java 1.6+ garbage collector logs (including G1 collector)

free-programming-books. :books: Freely available programming books

CodeFlower. Source code visualization utility written in JavaScript with d3.js. Does your code look beautiful?

cool-retro-term. A good looking terminal emulator which mimics the old cathode display...

resume.github.com. Resumes generated using the GitHub informations