Jussi Virtanen

numba. NumPy aware dynamic Python compiler using LLVM

llfix. Open-source edition of llfix, a low latency FIX engine

json_exporter. A prometheus exporter which scrapes remote JSON by JSONPath

yaml. YAML parser and serialiser for JavaScript

swipl-devel. SWI-Prolog Main development repository

Beyond-All-Reason. Main game repository for Beyond All Reason.

valkey-glide. An open source Valkey client library that supports Valkey, and Redis open source 6.2, 7.0 and 7.2. Valkey GLIDE is designed for reliability, optimized performance, and high-availability, for Valkey and Redis OSS based applications. GLIDE is a multi language client library, written in Rust with programming language bindings, such as Java and Python

pyrefly. A fast type checker and language server for Python

ternfs. An exabyte-scale, multi-region distributed file system

fluent-bit. Fast and Lightweight Logs, Metrics and Traces processor for Linux, BSD, OSX and Windows

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

certbot. Certbot is EFF's tool to obtain certs from Let's Encrypt and (optionally) auto-enable HTTPS on your server. It can also act as a client for any other CA that uses the ACME protocol.

terraform-provider-hcloud. Terraform Hetzner Cloud provider

ardupilot. ArduPlane, ArduCopter, ArduRover, ArduSub source

uv. An extremely fast Python package and project manager, written in Rust.

ruff-action. A GitHub Action to run Ruff

xee. XPath, XSLT

typescript-go. Staging repo for development of native port of TypeScript

undici. An HTTP/1.1 client, written from scratch for Node.js

norwegianblue. CLI to show end-of-life dates

djl. An Engine-Agnostic Deep Learning Framework in Java

systemd. The systemd System and Service Manager

opendal. Apache OpenDAL: One Layer, All Storage.

setup-terraform. Sets up Terraform CLI in your GitHub Actions workflow.

OpenMetrics. Evolving the Prometheus exposition format into a standard.

turmoil. Add hardship to your tests

ghostty. 👻 Ghostty is a fast, feature-rich, and cross-platform terminal emulator that uses platform-native UI and GPU acceleration.

s3fs. S3 Filesystem

FirewallChecker. A self-contained firewall checker

tagline. Fast FIX codec for Netty

aiokdb. Pure Python asyncio connector to KDB using only builtin core data types

delta. An open-source storage framework that enables building a Lakehouse architecture with compute engines including Spark, PrestoDB, Flink, Trino, and Hive and APIs

jsr. The open-source package registry for modern JavaScript and TypeScript

marimo. A reactive notebook for Python — run reproducible experiments, query with SQL, execute as a script, deploy as an app, and version with git. Stored as pure Python. All in a modern, AI-native editor.

cosmopolitan. build-once run-anywhere c library

freeze. Generate images of code and terminal output 📸

configure-aws-credentials. Configure AWS credential environment variables for use in other GitHub Actions.

swish. Swish Concurrency Engine

llrt. LLRT (Low Latency Runtime) is an experimental, lightweight JavaScript runtime designed to address the growing demand for fast and efficient Serverless applications.

duckdb. DuckDB is an analytical in-process SQL database management system

nyrkio. Nyrkiö is an open source platform for detecting performance changes in a Continuous Performance Engineering workflow

quickjs. Public repository of the QuickJS Javascript Engine.

client_java. Prometheus instrumentation library for JVM applications

hubris. A lightweight, memory-protected, message-passing kernel for deeply embedded systems.

pandoc. Universal markup converter

polars. Extremely fast Query Engine for DataFrames, written in Rust

z3. The Z3 Theorem Prover

activej. ActiveJ is an alternative Java platform built from the ground up. ActiveJ redefines core, web and high-load programming in Java, providing simplicity, maximum performance and scalability

OnlineStats.jl. ⚡ Single-pass algorithms for statistics

aws-sdk-java-v2. The official AWS SDK for Java - Version 2

python-skyfield. Elegant astronomy for Python

river. Fast and reliable background jobs in Go

double-conversion. Efficient binary-decimal and decimal-binary conversion routines for IEEE doubles.

optimized-routines. Optimized implementations of various library functions for ARM architecture processors

sqlite-jdbc. SQLite JDBC Driver

pyright. Static Type Checker for Python

purescm. Scheme backend for PureScript (a small strongly, statically typed programming language with expressive types, inspired by Haskell).

hacl-star. HACL*, a formally verified cryptographic library written in F*

aws-advanced-jdbc-wrapper. The Amazon Web Services JDBC Driver has been redesigned as an advanced JDBC wrapper. This wrapper is complementary to and extends the functionality of an existing JDBC driver to help an application take advantage of the features of clustered databases such as Amazon Aurora.

CoralCpp. Call Java from C++ and C++ from Java with a variety of old and new projects like JNI, JNA, JNR, FFM, JExtract, BridJ, GraalVM, JNI-Bind, etc.

CoralME. A simple, fast and garbage-free matching engine order book that you can use as a starting point for your matching engines.

execution-specs. Specification for the Execution Layer. Tracking network upgrades.

terraform-provider-grafana. Terraform Grafana provider

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

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

ClickHouse. ClickHouse® is a real-time analytics database management system

questdb. QuestDB is a high performance, open-source, time-series database

ArcticDB. ArcticDB is a high performance, serverless DataFrame database built for the Python Data Science ecosystem.

aws-crt-java. Java bindings for the AWS Common Runtime

graalpython. GraalPy – A high-performance embeddable Python 3 runtime for Java

mypy. Optional static typing for Python

aoc21. Advent of Code 2021 in the UNIX “little languages”: sh, awk, bc, sed

amzn-drivers. Official AWS drivers repository for Elastic Network Adapter (ENA) and Elastic Fabric Adapter (EFA)

awesome-financial-open-source. Collection of financial institution open source groups

uncurled. Uncurled - everything I know and learned about running and maintaining Open Source projects for three decades.

everything-curl. The book documenting the curl project, the curl tool, libcurl and more. Simply put: everything curl.

parquet-format. Apache Parquet Format

arrow. Apache Arrow is the universal columnar format and multi-language toolbox for fast data interchange and in-memory analytics

cozo. A transactional, relational-graph-vector database that uses Datalog for query. The hippocampus for AI!

xtdb. An immutable SQL database for application development, time-travel reporting and data compliance. Developed by @juxt

clojure. The Clojure programming language

mastodon. Your self-hosted, globally interconnected microblogging community

markdoc. A powerful, flexible, Markdown-based authoring framework.

ruff. An extremely fast Python linter and code formatter, written in Rust.

dbn. Databento Binary Encoding (DBN) - Fast message encoding and storage format for market data

tigerbeetle-java. TigerBeetle Java client

nalim. Fast Java native interface based on JVMCI

firecracker. Secure and fast microVMs for serverless computing.

micro-http. A minimal HTTP implementation used by Firecracker

lila. ♞ lichess.org: the forever free, adless and open source chess server ♞

agones. Dedicated Game Server Hosting and Scaling for Multiplayer Games on Kubernetes

craigstarter. An open source crowdfunding tool built on Shopify

TypeScript. TypeScript is a superset of JavaScript that compiles to clean JavaScript output.

zookeeper. Apache ZooKeeper

moditect. Tooling for the Java Module System

orchestrations. Service offerings expressed with Orchestra

ws. Simple to use, blazing fast and thoroughly tested WebSocket client and server for Node.js

leveldb. LevelDB is a fast key-value storage library written at Google that provides an ordered mapping from string keys to string values.

dotfiles. My dotfiles

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

caffeine. A high performance caching library for Java

tigerbeetle. The financial transactions database designed for mission critical safety and performance.

analytics. Open source, privacy-first web analytics. Lightweight, cookie-free Google Analytics alternative. Self-hosted or cloud.

openbgpd-portable. Portable build framework for OpenBGPD

awesome-low-latency. Patterns and resources of low latency programming.

terraform. Terraform enables you to safely and predictably create, change, and improve infrastructure. It is a source-available tool that codifies APIs into declarative configuration files that can be shared amongst team members, treated as code, edited, reviewed, and versioned.

clojure.java-time. Java 8 Date-Time API for Clojure

jansson. C library for encoding, decoding and manipulating JSON data

codeql-java-queries. Personal CodeQL queries

tls-channel. A Java library that implements a ByteChannel interface over SSLEngine, enabling easy-to-use (socket-like) TLS for Java applications.

minio. MinIO is a high-performance, S3 compatible object store, open sourced under GNU AGPLv3 license.

sassy. Sassy Audio Spreadsheet

DistributedATS. DistributedATS is a FIX Protocol based multi matching engine exchange(CLOB) that integrates QuickFIX and LiquiBook over DDS

swagger-ui. Swagger UI is a collection of HTML, JavaScript, and CSS assets that dynamically generate beautiful documentation from a Swagger-compliant API.

exchange-core. Ultra-fast matching engine written in Java based on LMAX Disruptor, Eclipse Collections, Real Logic Agrona, OpenHFT, LZ4 Java, and Adaptive Radix Trees.

GCGC. Jupyter Notebook

fix-antenna-net-core. FIX Antenna™ .NET Core is a high-performance low latency .NET FIX Engine.

yyjson. The fastest JSON library in C

ftx-fix-example. Simple example application for FTX FIX API

gson. A Java serialization/deserialization library to convert Java Objects into JSON and back

simplefix. Simple FIX protocol implementation for Python

fix8. Modern open source C++ FIX framework featuring complete schema customisation, high performance and fast development.

quickfixj. QuickFIX/J is a full featured messaging engine for the FIX protocol. - This is the official project repository.

fastjson. FASTJSON 2.0.x has been released, faster and more secure, recommend you upgrade.

rapidjson. A fast JSON parser/generator for C++ with both SAX/DOM style API

jackson-databind. General data-binding package for Jackson: works on streaming API (core) implementation(s)

jackson-core. Core part of Jackson that defines Streaming API as well as basic shared abstractions

coinbase-fix-example. Simple example application for Coinbase Pro FIX API

jargon. Java

trilogy. Trilogy is a client library for MySQL-compatible database servers, designed for performance, flexibility, and ease of embedding.

Stockfish. A free and strong UCI chess engine

hercules. Gaining advanced insights from Git repository history.

spotless. Keep your code spotless

tenderjit. JIT for Ruby that is written in Ruby

byte-buddy. Runtime code generation for the Java virtual machine.

esbuild. An extremely fast bundler for the web

fasterjsonorg.github.io. HTML

cortex. A horizontally scalable, highly available, multi-tenant, long term Prometheus.

elasticmq. In-memory message queue with an Amazon SQS-compatible interface. Runs stand-alone or embedded.

babl. Low-latency WebSocket Server

vim-hocon. Syntax highlighting for the HOCON language

litestream. Streaming replication for SQLite.

jmh. https://openjdk.org/projects/code-tools/jmh

sched. A small Java library to set the CPU affinity mask of the current thread

c2clat. A tool to measure CPU core to core latency

tmux. tmux source code

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

gdax-java. Java based wrapper for Coinbase Pro (Formerly known as GDAX API and Coinbase Exchange API)

aeron. Efficient reliable UDP unicast, UDP multicast, and IPC message transport

agrona. High Performance data structures and utility methods for Java

SPSCQueue. A bounded single-producer single-consumer wait-free and lock-free queue written in C++11

MPMCQueue. A bounded multi-producer multi-consumer concurrent queue written in C++11

book-concierge. A concierge for every year

hackers-tiny-slide-deck. Turn a Markdown document into a slide deck quickly

fastnetmon. Very fast DDoS sensor with sFlow/Netflow/IPFIX/SPAN support

homebrew-chnode. Homebrew tap for chnode

bit. Simple command line utility for working with Bitbucket

kitty. If you live in the terminal, kitty is made for you! Cross-platform, fast, feature-rich, GPU based.

awesome-lockfree. A collection of resources on wait-free and lock-free programming

manticore. Manticore is a research operating system, written in Rust.

legacy-free-x86. OS development resources for legacy-free x86 hardware.

jwalk. Streaming JSON parser for Unix

guard-terraform. Guard plugin for checking and optionally fixing Terraform configuration formatting and style

JVArgumentParser. Simple Objective-C library for parsing command line arguments

chnode. Changes shell's current Node.js version by updating $PATH

hotfix. Low latency fix engine for .net

vim-hcl. Syntax highlighting for HashiCorp Configuration Language (HCL)

epsilon. Modern graphing calculator operating system.

sphinx. Sphinx is a fast in-memory key-value store, compatible with Memcached.

CharConv. Fast integer to string and string to integer conversion functions

artio. Artio - Resilient High-Performance FIX and FIXP Gateway

node-parity-pmr. JavaScript

genesis. JavaScript

ustat. ustat - an unified system stats collector tool

bonsai. Beautiful trees, without the landscaping.

node-soupbintcp. NASDAQ SoupBinTCP 3.00 client and server on Node

node-parity-poe. JavaScript

awesome-modern-cpp. A collection of resources on modern C++

foundation. Utility library for network protocols on the JVM

ipc-bench. Latency benchmarks of Unix IPC mechanisms

level-ip. A hacker's userspace TCP/IP stack

philadelphia-extras. Extensions to Philadelphia

numpy. The fundamental package for scientific computing with Python.

molderl. Basic implementation of a MOLDUDP64 server

philadelphia. Fast FIX protocol library for the JVM

scylladb. NoSQL data store using the Seastar framework, compatible with Apache Cassandra and Amazon DynamoDB

Strata. Open source analytics and market risk library from OpenGamma

ocaml-fix. FIX protocol for OCaml

hffix. Financial Information Exchange Protocol C++ Library

helix. Helix, a market data feed handler for C and C++.

simple-binary-encoding. Simple Binary Encoding (SBE) - High Performance Message Codec

node-parity-pmd. JavaScript

api. HTML

paritytrading.github.io. HTML

nasdaq-tools. Java

juncture. Fast trading protocol library for the JVM

octodown. Github markdown previewing straight from your shell.

anki-crawler. Parses anki-cards from a text file and uploads them to AnkiWeb

nasdaq-omx-simulator. NASDAQ OMX simulator

nassau. Fast Nasdaq transport protocol library for the JVM