Find the best open-source alternatives

A Nix-powered, high-performance build cache and remote execution server compatible with Bazel, Buck2, and other RE build systems.

A Docker image for running Android emulators with noVNC support, video recording, and integration for development and testing.

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

A cross-platform UI framework for .NET that builds desktop, mobile, embedded, and WebAssembly apps using C# and XAML.

A terminal emulator that arranges multiple GNOME terminals in a single window with split panes and grouping.

A lightweight, multi-platform email and SMTP testing tool with a web UI and API for developers.

A privacy-focused web browser that blocks trackers and ads by default while rewarding users with Basic Attention Tokens.

A decentralized, Byzantine Fault Tolerant SQL database built on SQLite with blockchain features for serverless applications.

An open-source Ruby on Rails CRM platform for managing leads, contacts, opportunities, and campaigns with group collaboration.

A Go package for detecting MIME types and file extensions based on magic numbers, prioritizing common formats and supporting extension.

An online mind mapping editor with native-like interaction, cloud sync, and instant sharing capabilities.

A Java agent enabling unlimited runtime class and resource redefinition for faster development cycles.

A self-hosted, privacy-first CAPTCHA alternative using proof-of-work to protect websites and APIs from spam without tracking.

A C/C++ library that compiles Sass to CSS, offering a portable and efficient alternative to Ruby Sass.

A modern runtime for JavaScript, TypeScript, and WebAssembly with secure defaults and excellent developer experience.

An open-source implementation of Microsoft's .NET Framework for building cross-platform applications.

A human-friendly and powerful HTTP request library for Node.js with advanced features like retries, caching, and HTTP/2 support.

A modern open-source Dependency Walker rewrite for Windows developers to troubleshoot DLL load dependencies.

A libre file transfer client for macOS and Windows supporting FTP, SFTP, WebDAV, Amazon S3, Azure, OneDrive, and more.

An extremely fast Python package and project manager written in Rust, replacing multiple existing tools.

A fast, safe, thread-friendly regular expression library with linear-time matching guarantees, designed for production use.

A high-performance distributed map/reduce system with DAG execution, written in Go, supporting standalone or distributed modes.

ripgrep is a fast, line-oriented search tool that recursively searches directories for regex patterns while respecting gitignore rules.

A macOS audio utility that automatically pauses music, controls per-app volumes, and records system audio.

A jQuery plugin for creating interactive, sortable, and searchable HTML tables from JSON data or existing markup.

A deep learning framework for Julia with GPU support and automatic differentiation using dynamic computational graphs.

A super minimal, modular presentation micro-framework for modern browsers with a rich plugin ecosystem.

A Python-based interactive packet manipulation program and library for network analysis, scanning, and security testing.

A Go vector graphics library that renders to SVG, PDF, raster images, HTML Canvas, and more with advanced text and path operations.

A free, customizable macOS system monitor that displays CPU, memory, network, temperature, and fan stats in the menu bar.

A modular Ruby toolkit for handling file uploads, processing, and storage with support for cloud services and multiple ORMs.

An open-source memory forensic framework for extracting and analyzing digital artifacts from Windows, Linux, and OSX memory images.

A cross-platform backup tool for PC video game save data, supporting over 19,000 games and multiple game stores.

A responsive front-end framework for building prototypes and production sites that work on any device.

An R package that extends ggplot2 to create publication-ready graphics with statistical details embedded directly in the plots.

A distributed storage system for object storage (S3), file systems, and Iceberg tables, optimized for billions of files with O(1) disk access.