Find the best open-source alternatives

A high-performance REST API client library for .NET with interface-based declaration, AOT support, and advanced features.

A simple, fast, accurate single-header microbenchmarking library for C++11/14/17/20.

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

A Python library for lightning-fast univariate time series forecasting with optimized statistical and econometric models.

A fast, hermetic, multi-language build system designed for large-scale projects and distributed compilation.

An open-source, fully offline voice assistant for many languages, designed for private home automation.

A general-purpose literate programming engine for dynamic report generation in R, designed to give users full control over output.

A hackable open-source voice assistant platform for building and running custom voice-controlled applications.

A full node Bitcoin implementation written in Go, providing an alternative to Bitcoin Core with a focus on modularity.

A minimalist-friendly ~2.2KB routing library for React and Preact apps, built with hooks.

An ultra-lightweight Python interpreter for microcontrollers, requiring only 4KB of RAM and zero dependencies.

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

A standalone Python framework for orchestrating autonomous AI agents that collaborate to tackle complex tasks.

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

Open-source authentication and session management service, providing a self-hosted alternative to Auth0, Firebase Auth, and AWS Cognito.

A mobile-first note-taking app that stores Markdown notes in a Git repository for privacy and data portability.

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

A powerful open-source pixel art editor for creating sprites, tiles, animations, and 2D artwork with advanced tools and animation support.

A self-hosted photo management system for uploading, organizing, and sharing photos with a native-like experience.

An open source, serverless security data lake for AWS that normalizes logs, enables detection-as-code, and supports petabyte-scale threat hunting.

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

Open-source data integration platform for building ELT pipelines from APIs, databases, and files to data warehouses, lakes, and lakehouses.

A multi-threaded Python brute-forcing tool with a modular design for reliable and flexible password guessing attacks.

A macOS QuickLook extension that adds thumbnail, preview, and metadata support for non-native video and audio file formats.

A multi-chain animation library for iOS that simplifies creating complex, readable animations in Objective-C and Swift.

An open-source HTML5 video player with Flash fallback for web developers.

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

An open-source, self-hosted emailing platform for sending newsletters and transactional emails with enterprise-grade features.

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

A standard library for JavaScript and TypeScript with an emphasis on numerical and scientific computation.

An open-source authentication and user management solution with passkeys, MFA, OAuth SSO, and SAML support.

A powerful open-source pixel art editor for creating sprites, tiles, animations, and 2D artwork with advanced tools and animation support.

A lightweight cross-platform Rust game framework for creating 2D and 3D games with minimal friction.

A simple, fast, robust job/task queue for Node.js, backed by Redis, designed for short real-time jobs.

A grep-based source code auditing tool that finds potential security flaws using signature databases for multiple programming languages.

Open-source, headless, multi-tenant eCommerce platform built with .NET Core and MongoDB.