Open-source alternatives to Cosmopolitan

This project is a cross-platform managed execution environment and general-purpose application framework designed for building high-performance software. It provides a unified runtime that handles memory management, type safety, and code execution across diverse operating systems. By integrating a native code compilation toolchain, the platform enables developers to convert managed code into optimized machine instructions, significantly improving startup performance and reducing runtime dependencies for production environments. The framework distinguishes itself through a comprehensive toolch

microui is a minimal immediate-mode graphical user interface library written in C, designed for resource-constrained environments such as embedded systems. It operates without dynamic memory allocation and has no external dependencies beyond standard C, making it a self-contained solution for building lightweight interfaces. The library is delivered as a single header file, simplifying integration into any project. It uses a fixed-allocator heap for all runtime state, guaranteeing deterministic memory use and predictable performance. All drawing is delegated to user-supplied callbacks, keepin

Nuklear is a minimal, header-only graphical user interface toolkit written in C. It utilizes an immediate-mode rendering model, where the interface is reconstructed and drawn directly within the application loop each frame. This approach eliminates the need for persistent widget state or complex synchronization between the interface and underlying application data. The library is designed for portability and integration into resource-constrained environments. It requires the host application to manage memory manually, allowing it to function in systems that lack standard library support. By d

This project is a collection of portable, header-only C functions designed for integration into software projects without complex build dependencies or external linking requirements. It provides a suite of low-level utilities for graphics, audio, and data management, focusing on direct memory manipulation and zero-dependency portability. By utilizing a single-header distribution model, the library simplifies dependency management while allowing developers to maintain full control over memory allocation and binary size through compile-time configuration. The library distinguishes itself by off

This project is a C-based multimedia toolkit and cross-platform game framework designed for building interactive applications. It provides a low-level programming interface that grants direct access to hardware-accelerated graphics, real-time audio processing, and user input handling. By utilizing an immediate-mode rendering architecture, the library processes visual state changes frame-by-frame, which simplifies the logic required for dynamic interfaces and interactive simulations. The library distinguishes itself through a zero-dependency design that avoids complex external build requiremen

This project is an open-source software development kit and framework for implementing the Matter smart home standard. It provides a universal IPv6-based application layer and a cluster-based data model to ensure interoperability between diverse smart home devices and controllers. The system is distinguished by its multi-transport network abstraction, which maps Bluetooth LE, Thread, and Wi-Fi implementations to a common layer. It includes specialized tooling for secure device commissioning via QR codes and NFC, as well as a comprehensive over-the-air firmware update system for distributing s

Bettercap is an extensible framework for network security testing that provides a unified interface for performing man-in-the-middle attacks, network reconnaissance, and traffic manipulation across WiFi, Bluetooth, and wired networks. It operates through a modular attack module system that loads and executes interchangeable offensive or diagnostic modules, supported by event-driven session management and multi-protocol network spoofing capabilities. The framework distinguishes itself by covering a broad range of network domains, including Bluetooth Low Energy scanning and enumeration, CAN-Bus

This repository is a curated collection of official Dart packages and Flutter plugins maintained by the framework creators. It serves as a centralized source of modular code libraries and verified extensions designed to provide standardized access to native device hardware and operating system APIs. The collection provides cross-platform UI component libraries that ensure consistent interface elements and widgets across different operating systems. These official plugins integrate standard features into applications through a set of maintained libraries. The project covers a broad range of c

randomcompat is a backward-compatibility library that provides cryptographically secure random number generation functions for PHP 5.x environments. It delivers the randombytes() and random_int() functions that are natively available in PHP 7+, enabling legacy applications to generate secure random bytes and unbiased integers from system entropy sources. The library implements a priority-based fallback chain across operating-system CSPRNGs, selecting the best available random source in order of security. It uses rejection sampling to convert raw random bytes into unbiased integers withi

FlutterFire is a set of plugins and libraries that provide a Firebase SDK for applications built with the Flutter framework. It functions as a cloud services wrapper that maps Firebase cloud APIs to the Dart programming language, enabling backend integration for cloud data storage, user authentication, and serverless function execution. The project uses a plugin-based modular architecture to separate different cloud services into independent packages. It employs platform-interface abstractions and method-channel-based native interoperability to communicate with native Android and iOS SDKs thr

Magnum is a C++ middleware suite for cross-platform graphics development and real-time data visualization. It provides a hardware-agnostic rendering layer that translates graphics commands into platform-specific calls, ensuring consistent behavior across different GPU drivers and APIs such as Vulkan. The project focuses on decoupling application logic from underlying hardware through abstract graphics and system utilities. It features a plugin-based resource importer for 3D assets and audio, a hierarchical scene graph for spatial transformations, and a high-performance signal-based event syst

Macroquad is a Rust game engine and 2D graphics library designed for developing cross-platform games and graphical applications. It functions as a rendering engine that enables the deployment of a single codebase to desktop, mobile, and web targets. The engine utilizes an immediate mode rendering model, which allows for the creation of user interfaces and game worlds that render in a single pass within the main application loop. This approach is paired with hardware-accelerated 2D rendering and automatic draw call batching to optimize the display of geometry across different hardware devices.

Recorder is a JavaScript library for capturing audio from microphones and encoding the resulting data into multiple formats, including MP3, WAV, and WebM. It provides a unified interface for cross-platform audio recording across web browsers and mobile applications. The library functions as an audio signal processing tool and waveform visualizer, offering real-time visual feedback through frequency histograms and waveforms. It includes specialized capabilities for encoding and decoding dual-tone multi-frequency telephone keypad tones. The project covers a broad range of audio manipulation ca

WeiXinMPSDK is a .NET software development kit designed to integrate WeChat services, official accounts, and mini programs into applications. It provides a multi-platform bot framework and a programmatic interface to interact with official, mini, and corporate accounts across the WeChat ecosystem. The project features interface-based platform abstraction and logic unification, allowing a single codebase to target multiple target platforms. It includes a messaging middleware for routing incoming requests and a distributed caching layer using providers like Redis or Memcached to synchronize ses

This project is a cross-platform mobile media picker that provides a native interface for selecting images and videos from a device gallery or capturing them via the camera. It acts as a bridge for mobile camera integration and a native gallery selector to import visual assets into a JavaScript environment. The library covers media library access and the handling of user content uploads by allowing users to provide image or video files from their device. This includes the ability to launch the device camera for photos and videos as well as selecting multiple media files from the local library

Open Interpreter is a coding agent that uses large language models to write and execute code directly on a local host machine. It functions as a system for performing operating system tasks and file manipulations through a natural language interface. The project features a model orchestrator that allows switching between different language model providers and emulation harnesses. It employs a loop-based reasoning process to iteratively generate code and process execution output until a goal is achieved. Its capabilities include cross-platform system automation, local model integration for da

MvvmCross is a .NET MVVM framework designed for building cross-platform applications by separating business logic from native user interfaces. It functions as a navigation engine and a UI data binding library, enabling the encapsulation of logic within view models that are reused across different operating systems. The framework provides a native hardware abstraction layer and a dependency injection container to decouple components and provide a consistent interface for accessing device features. It coordinates type-safe transitions between native screens and manages the synchronization of da

This repository is for the legacy Mixed Reality Toolkit (MRTK) v2. For the latest version of the MRTK please visit https://github.com/MixedRealityToolkit/MixedRealityToolkit-Unity

SkiaSharp is a cross-platform 2D graphics engine and .NET wrapper for the Skia Graphics Library. It provides a rendering API for drawing shapes, paths, and bitmaps across mobile, desktop, and server environments, functioning as both a raster graphics library and a hardware-accelerated drawing API. The project enables the creation of custom vector drawings and dynamic UI components through precise control over strokes, fills, and mathematical transformations. It also supports programmatic image manipulation, allowing for the loading and modification of pixel arrays. Its capabilities cover bas

The Rust RFCs repository is the formal home for the Rust language evolution process, housing the structured design documents and community review mechanisms that govern changes to the Rust programming language, its compiler, and its standard library. It defines the complete lifecycle for proposing, discussing, and implementing substantial changes through RFC documents, from initial submission and community feedback through final comment periods and sub-team sign-offs. The repository codifies the governance and collaboration processes that shape Rust's development, including mechanisms for com

Ebiten is a cross-platform 2D game engine and framework for the Go programming language. It provides a hardware-accelerated 2D renderer and a multi-input handling library to develop two-dimensional games with a single codebase. The engine is designed for broad deployment, allowing applications to be compiled and run across desktops, mobile devices, web browsers, and gaming consoles. It distinguishes itself by integrating custom shader programming for specialized visual effects and providing haptic feedback control for mobile devices and gamepads. The framework covers core game development ca

LibGDX is a Java-based framework designed for cross-platform game development, enabling the creation and deployment of 2D and 3D games across desktop, mobile, and web environments from a single codebase. It functions as a comprehensive library that abstracts hardware-accelerated graphics, audio, input, and file system access, providing a unified interface for developers to manage game logic and application lifecycles. The framework distinguishes itself through a high-performance architecture that prioritizes efficiency and native interoperability. It utilizes a batch-oriented graphics pipelin

AppImageKit is a set of utility tools for the portable Linux application format, designed to bundle desktop applications into single executable binaries that run across multiple Linux distributions without requiring a system-wide installation. The toolkit provides specialized utilities for packaging applications into standalone binaries, extracting embedded filesystem images for inspection or execution, and signing binaries with cryptographic signatures to verify authenticity and integrity. The project covers binary packaging and deployment, embedded filesystem management, and digital packag

AppImageKit is a system of tools and utilities for bundling Linux desktop applications into single-file, portable executables. It functions as a packager that converts application directories into self-mounting binaries, allowing software to run across multiple Linux distributions without a formal installation process. The project enables portable software distribution by isolating application configurations and home directories from the host system, which allows applications to run from removable media. It includes a filesystem manager for extracting, inspecting, and mounting the embedded im

Urho3D is a cross-platform 3D game engine written in C++. It uses a component-based scene graph to compose game objects from nodes and attached components, separating transforms from behaviors for modular design. The engine integrates AngelScript and Lua scripting for game logic, uses the Bullet library for physics simulation, and renders scenes with OpenGL or Direct3D through forward, deferred, or light pre-pass pipelines with customizable render passes and shadow mapping. The engine distinguishes itself with a built-in visual scene and UI editor for composing 3D worlds and interface layouts

Conan is a package manager and binary repository for C and C++ that resolves and installs external libraries to ensure consistent build environments across different platforms. It functions as a native dependency resolver and a cross-platform build tool designed to facilitate reproducible native builds. The project provides capabilities for native package hosting, allowing users to implement a server to store and distribute pre-compiled libraries and their required dependencies. It also supports standalone binary bundling to create executable files that include all necessary runtime dependenc

Swift Package Manager is a cross-platform build tool, dependency resolver, and package distributor. It compiles Swift source code into native executable binaries for multiple operating systems and manages the resolution and linking of external Swift code packages. The tool facilitates Swift package distribution by sharing and distributing reusable source code through public or private channels. It orchestrates Swift projects by managing external code libraries and versioning to ensure consistent builds across different development environments.