Find the best open-source alternatives

An Android library for pull-based remote notifications using JSON files, as an alternative to Google GCM/Amazon SNS.

A Neovim plugin that provides VSCode-style diff rendering with two-tier highlighting (line + character level) in side-by-side and inline layouts.

A high-performance multi-language serialization framework using JIT compilation and zero-copy techniques for fast data exchange.

A bookmarklet and browser extension that analyzes web page performance using the Resource Timing, Navigation Timing, and User-Timing APIs.

Web components for creating interactive, serverless coding environments with live previews.

A standalone tool for viewing massive point clouds (billions of points) in your browser or via a native SDL client.

An auto-generated, fully type-safe database client for Go that reduces boilerplate.

A super-fast Rust-based TypeScript/JavaScript compiler for faster web development.

A Node.js load testing tool for HTTP and WebSocket URLs with configurable requests, concurrency, and rate limiting.

A fast CLI tool for running multiple npm scripts with parallel/series execution and shell completion.

A single-header, public domain, short vector math library for C++ inspired by shading languages.

Legacy JavaScript mapping library built on Leaflet for creating interactive web maps with Mapbox services.

A scriptable HTTP service and asyncio driver for headless Chrome, compatible with the Splash API.

A YAML-based language for designing and documenting HTTP-based RESTful APIs.

A distributed storage benchmark tool for file systems, object stores, and block devices with GPU support.

An Intrusion Prevention System (IPS) for SSH that blocks brute force attacks using iptables and optional nmap/dig probes.

A highly configurable cross-platform terminal emulator with integrated SSH and serial client capabilities.

A lightweight open-source computer algebra library for .NET, Silverlight, and Mono, written in F#.

A fast, single-file similarity search and clustering engine for vectors and arbitrary objects with multi-language bindings.

A pure Go library for accessing Raspberry Pi GPIO pins without external C dependencies.

A header-only C++ library for solving large-scale eigenvalue problems, built on top of Eigen.

A Swagger/OpenAPI toolchain for .NET, ASP.NET Core, and TypeScript that generates specifications and client code.

A simple, secure, and fast identity management platform for self-hosted authentication, supporting OAuth2, LDAP, RADIUS, and Unix integration.

A high-performance PDF toolkit for text/image extraction, markdown conversion, and PDF editing, built in Rust with Python, WASM, CLI, and MCP server bindings.

A fuzzy command-line completer that generates custom completions from user-defined patterns and commands.

Catalyst is a high-performance C# NLP library inspired by spaCy, offering pre-trained models, entity recognition, and embedding training.

A simple Unix shell written in Rust with built-in math arithmetic and bash-like features.

A free, open-source sandbox space exploration game featuring trading, combat, missions, and an evolving storyline.

A roguelike dungeon management game where you build and defend your dungeon while raiding others.

A customizable word clock widget for iOS, iPadOS, and macOS that displays the current time in written words across 21+ languages.

An easy-to-use, self-hosted PaaS platform that automates Docker, nginx, and SSL for deploying web apps and databases.

An open-source, self-hosted deployment platform that replaces Vercel and other SaaS tools with a single binary.

A Neovim file manager plugin powered by the nnn terminal file browser.

An open-source firewall for AI agents that prevents data leaks, dangerous tool usage, and supply chain attacks.

A self-hosted web file manager and storage hub with granular ACLs, optional encryption, WebDAV, and AI workflows.

Build cross-platform native Progressive Web Apps for iOS, Android, and the Web with a single JavaScript codebase.