Find the best open-source alternatives

A single-file TLS 1.0-1.3 and DTLS implementation in C, using libtomcrypt for cryptography.

A Python library for programming 2D/3D games, graphics, and sound synthesizers interactively in Jupyter notebooks.

A cross-platform desktop application for editing and previewing Markdown files in real-time.

Python bindings for the Mapnik C++ library, enabling programmatic map rendering and geospatial visualization.

A very fast and accurate code counter with complexity calculations, COCOMO/LOCOMO estimates, and unique line metrics written in pure Go.

A free, fully featured model rocket simulator for designing and simulating rockets before building and flying them.

A property-based testing library for Scala with advanced generators, flexible configuration, and full Scala.js/scala-native support.

A computing-focused community platform for link aggregation and discussion, built with Ruby on Rails.

Fast and extensible multi-platform HTTP/1-2-3 web server with automatic HTTPS by default.

A Godot plugin for procedural audio and adaptive music, enabling complex soundscapes with minimal code.

An open-source API for metering and usage-based billing, supporting hybrid pricing models and self-hosting.

A C++20 single-header, macro-free μ(micro)/unit testing framework focused on fast compilation and modern C++ features.

Effects-based direct-style parallel IO stack for OCaml 5, enabling concurrent file, network, and CPU operations with a secure, cross-platform API.

A flexible static site generator for blogs written in Common Lisp, using Git for storage and supporting plugins.

A tiny, high-performance JavaScript library for color parsing, manipulation, and conversion with a plugin-based architecture.

A lightweight React internationalization library based on the ICU standard, optimized for bundle size and performance.

A Python library and CLI for creating interactive visualizations of security and system logs like Cuckoo JSON and ProcMon CSV.

A generic and open signature format for describing log event detections, shareable across SIEM systems.

A lightweight, fast, and simple 3D physics engine in C++ designed for games, supporting only box collision for ease of use.

An online estimation tool for Agile teams to collaboratively estimate story points using planning poker.

An open-source VTuber application built with Godot 4 for real-time facial motion capture and avatar animation.

A Windows toolkit for analyzing, editing, and manipulating Portable Executable (PE) files and processes.

A CLI tool that executes SQL queries on CSV, LTSV, JSON, YAML, and TBLN files, with output to various formats.

Official .NET client libraries for Google Cloud Platform services, providing idiomatic APIs for cloud integration.

The admin interface for Ghost, a modern open-source publishing platform.

A Scriptable widget for iOS/iPadOS that displays local air quality index (AQI) using data from PurpleAir sensors.

Azure DevOps pipeline for scalable cloud load testing using Apache JMeter and Terraform to dynamically provision Azure Container Instances.

A TypeScript-focused functional programming utility library designed for use with R.pipe and strict currying.

A full-featured computer algebra system (CAS) written in pure Python for symbolic mathematics.

A modern, interactive JavaScript datatable library for displaying and editing tabular data on the web.

A lightweight, flexible, and safer alternative to chroot and Docker for creating virtual software environments using Linux namespaces.

A high-performance Java bean mapper offering elegance, robustness, and performance comparable to hand-written code.

A free and open-source parametric 3D CAD modeler for designing real-life objects of any size.

A drag-and-drop website builder and CMS with built-in e-commerce capabilities, built on Laravel.

An opinionated, zero-config static site generator using JSX/MDX with server-side React rendering.

A developer-friendly software simulator for HSM and smartcard with PKCS#11, REST API, and web UI for testing cryptographic applications.