Find the best open-source alternatives

A Swift library for macOS automation with mouse, keyboard control, screenshots, image recognition, and AI-powered agents.

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

An open-source middleware platform for building high-performance, distributed transaction processing applications in C/C++ and other languages.

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

A fully-featured, highly customizable JavaScript charting library for enterprise applications.

A React Native image sharing app with Instagram and Snapchat-like features including camera, video, and feed functionality.

A cross-platform terminal user interface (TUI) for managing Bluetooth adapters and devices.

A free, open-source distributed application framework for .NET that enables message-based, loosely-coupled asynchronous communication.

A full-featured, Markdown-based todo/task management plugin for Neovim with metadata, custom states, and archiving.

Automatically build and rebuild Xcode image catalogs for iOS/macOS app icons and universal images from source assets.

A lightweight, web-based raw text annotation tool for collaborative annotation projects with support for complex schemas.

A Godot Engine plugin for generating 3D trees with SpeedTree-like procedural generation capabilities.

A Swift library implementing 2D/3D vector and matrix functions for games and graphics, with a Swift-native API.

A composable, all-in-one mail server that implements SMTP, IMAP, DKIM, SPF, DMARC, and more in a single daemon.

A GPU-accelerated image and video processing framework for Apple platforms built on Metal.

A CLI tool to share files and directories between your computer and mobile devices via QR codes, no app required.

Automatically generates API client libraries, server stubs, and documentation from OpenAPI specifications.

A Python package that visualizes data structures, references, and mutability to aid debugging and teaching.

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

An open-source AI engine that runs LLMs, vision, voice, and image/video models on any hardware with drop-in OpenAI API compatibility.

A fast, small, and full-featured Inversion of Control container for .NET applications.

A simple, secure, and high-performance C library for reading and writing PNG files, designed as a modern alternative to libpng.

An open-source Identity Provider (IdP) for modern SSO, supporting SAML, OAuth2/OIDC, LDAP, RADIUS, and more.

A scope tree based, reflection-free Dependency Injection library for Java, Kotlin, and Android.

A single-binary mock server supporting HTTP, WebSocket, gRPC, MQTT, SSE, GraphQL, and SOAP protocols.

A self-contained, high-performance code coverage driver for PHP that's compatible with PHPUnit's CodeCoverage library.

An open-source productivity launcher for quick application launching, web searches, file navigation, and calculations.

A high-performance, fully managed ADO.NET data provider for MySQL and MariaDB, compatible with modern .NET.

A fast and lightweight terminal user interface for subscribing to MQTT topics and publishing messages from the command line.

A highly customizable, powerful and easy-to-use alerting library for Android, built with Kotlin.

A lightweight VPN built on IPFS and libp2p that creates direct encrypted tunnels between nodes, even behind NATs/firewalls.

Open-source GameStream client for embedded Linux systems like Raspberry Pi, enabling remote game streaming from PC.

A Django-based content management system focused on flexibility, user experience, and developer control.

A privacy-first, native macOS menu bar manager that hides unused icons, offers two viewing modes, and includes Touch ID lock and smart triggers.

A native macOS podcast client built with Swift, featuring a three-column layout and iTunes-style library support.

A functional, composable API for ActionScript 3 that simplifies working with both interactive (arrays) and reactive (events) data.