- bat - a replacement for the
cat
shell command written in Rust - Backstage - a platform for building developer portals written in TypeScript
- Bevy - a data-driven game engine written in Rust
- date-fns - a comprehensive JavaScript library for working with date values in the browser and Node.js
- fluent-assertions - a test assertion library for the .NET ecosystem written in C#
- Gitea, a self-hosted git server written in Go
- Home Assistant - a home automation system written in Python
- Humanizer - a .NET library for manipulating and displaying different kinds of values
- Jackson - a JSON library written in Java
- javers - an object auditing and diff framework for Java
- jbang - a tool for creating and running self-contained Java programs
- Jellyfin - a media server written in C#
- Jenkins - the open source continuous integration server
- MapTool - a virtual tabletop for playing roleplaying games written in Java
- Mermaid - a diagramming and charting library written in JavaScript
- NUnit - a unit testing framework for .NET languages
- oshi-ffm - an operating system and hardware information library for Java
- Play Framework - a web framework written in Scala
- Prometheus - a monitoring system written in Go
- rust-clippy - a linting tool for Rust code
- scrapy - a web scraping framework written in Python
- SpotBugs - the spiritual successor of the FindBugs static analysis tool for finding bugs in Java code
- starship - a customisable shell prompt written in Rust
- stylelint - a linter for CSS styles
- testcontainers-java - a Java library that enables using Docker containers in JUnit tests
- tldr-pages - a set of community-maintained help pages for command line tools written in Markdown
- ts-node - a TypeScript REPL for Node.js
- Check out the hacktoberfest topic on GitHub Explore