Open-source alternatives to CMake

nob.h is a build system automation tool for C projects that allows build scripts and execution logic to be defined directly in the C programming language. It provides a way to manage custom compiler orchestration and the sequence of shell commands required to transform source code into binaries. The project is implemented as a header-only library, allowing build tooling to be integrated without a separate compilation step. It supports multi-stage build workflows, enabling the execution of configuration steps and the generation of intermediate files before final compilation. The system handle

Nuke is a build automation system for defining software compilation and deployment pipelines using a strongly typed C# console application. It functions as a cross-platform build engine and pipeline orchestrator that treats build configurations as standard executable programs rather than static files. By leveraging a compiled language, the system provides type safety and IDE support for build script logic. This approach allows for the definition of automation and CI/CD pipelines using a professional programming language instead of YAML or shell scripts. The engine manages .NET project orches

PlatformIO Core is a toolset for embedded software development that manages the compilation, flashing, and debugging of firmware for various microcontroller targets. It provides a cross-platform build system that automates the process of transforming source code into binaries and transferring them to hardware via serial protocols. The system uses a plugin-based architecture to extend hardware platform support and incorporates a manifest-driven approach to resolve and install the specific toolchains, frameworks, and libraries required for different board definitions. Capabilities cover the fu

Redox is a POSIX-compliant, microkernel-based operating system written entirely in Rust. By utilizing a memory-safe language for the kernel and all system components, the project eliminates common vulnerabilities such as buffer overflows and use-after-free errors. Its architecture relies on a minimal kernel that manages only essential hardware and process isolation, delegating all other system services to unprivileged user-space processes. The system distinguishes itself through a modular design where hardware drivers and system services run as independent user-space daemons, allowing them to

LearnOpenGL is an educational resource and collection of C++ graphics implementations designed to teach the OpenGL graphics API. It provides code samples and reference implementations for real-time rendering, focusing on the creation of 2D and 3D visuals. The project includes practical examples of GLSL shaders for rendering 3D geometry and visual effects. These implementations are organized as a cross-platform graphics project, allowing the code to be built and executed across different operating systems. The repository covers the fundamental concepts of graphics programming, including shade

Gulp is a JavaScript build automation tool and Node.js task runner designed to coordinate the execution of development tasks. It operates as a streaming build system that transforms source files into production assets through a series of programmable pipelines. The system functions as a file watcher and task orchestrator, monitoring directories for modifications to automatically trigger specific build tasks. It organizes these units of work into sequential or parallel execution paths to streamline development workflows. The toolkit manages asset pipelines by reading files via pattern matchin

Ohm is a formal grammar parser generator and domain-specific language framework. It provides a system for defining custom languages to parse, validate, and extract data from input text, transforming raw strings into hierarchical abstract syntax trees based on specified formal rules. The project utilizes an Earley parsing algorithm, which allows it to support all context-free grammars, including those with left recursion and ambiguity, without requiring predefined operator precedence. It also includes a dedicated debugging toolkit for tracing and visualizing the step-by-step state transitions

Bazel is a multi-language build automation engine designed to manage complex dependency graphs and execute compilation tasks for massive codebases. It functions as a hermetic build environment, utilizing sandboxed execution and content-addressable caching to ensure that build artifacts are reproducible and that identical tasks are never re-executed. By modeling dependencies as a directed acyclic graph, the system determines optimal execution order and identifies tasks that can run in parallel. The project distinguishes itself through its support for distributed build execution, allowing resou

Task is a YAML-based task runner and build tool used to define and automate development workflows. It functions as a dependency-based build system and cross-platform task automator, allowing users to execute shell commands across different operating systems using a declarative configuration file. The project operates as an incremental build tool, utilizing file fingerprints and checksums to track state and avoid redundant work by determining if tasks are up to date. It manages execution via a dependency graph to ensure prerequisites are completed before target commands run. The system includ

Linuxtoys is a cross-distribution build system and package orchestrator designed to automate the creation of software for various Linux environments. It functions as a framework for compiling source code into native package formats, such as DEB and RPM files, while simultaneously providing the capability to generate standalone binaries that bypass complex host-level dependency management. The project distinguishes itself by utilizing isolated, container-based environments to ensure build consistency regardless of the underlying host configuration. It integrates host-aware dependency resolutio

Xmake is a cross-platform build utility and package manager designed for C and C++ development. It functions as a unified build automation tool that uses a Lua-based domain-specific language to define project targets, manage dependencies, and orchestrate compilation across multiple operating systems and hardware architectures. The system distinguishes itself through a modular, rule-based approach to task orchestration and toolchain integration. By abstracting native build systems and compilers, it allows developers to maintain consistent project configurations while targeting diverse environm

This project is a JavaScript optimizer, minifier, module bundler, transpiler, and static analysis tool. It provides a compilation pipeline designed to shrink file sizes and improve runtime performance. The system utilizes a multi-pass compilation process to perform dead code elimination, global name mangling, and static type inference. It identifies unreachable functions and unused variables to reduce the final output size and detects potential runtime errors without executing the code. The tool manages assets through dependency resolution, code chunking, and bundle management. It ensures co

Gatling is a load testing framework and traffic generation engine used to measure response times and error rates under heavy load. It functions as an as-code testing library, allowing users to define high-volume traffic simulations and performance tests through programming languages rather than graphical interfaces. The system enables multi-language load simulation and the ability to model concurrent user traffic to identify infrastructure bottlenecks and stability limits. It supports a test-as-code workflow, where version-controlled scripts are integrated into build pipelines as performance

PlatformIO is an embedded development platform and cross-platform build system for writing, compiling, and uploading firmware to various microcontroller architectures. It provides a unified environment for managing embedded software development across different hardware platforms. The project functions as an embedded library manager through a centralized registry for discovering and integrating third-party drivers and libraries. It also serves as a firmware debugging tool and an embedded unit testing framework, allowing for real-time hardware inspection and the execution of test suites direct

Penrose is a compiler that transforms structured mathematical notation into optimized SVG diagrams. It uses a three-stage pipeline of separate domain, substance, and style files to define mathematical objects, relationships, and visual presentation, then solves continuous optimization problems with user-defined spatial constraints and objectives to automatically arrange diagram elements. The system separates diagram content from visual style using distinct declarative languages, and provides a typed domain language with subtype hierarchies for mathematical objects. It supports embedding compi

MSBuild is a .NET build engine and software build automation system that transforms source code into deployable applications. It utilizes a declarative project system based on a structured XML schema to define build items, properties, and targets used across the .NET ecosystem and Visual Studio. The system features a customizable build task framework that allows the implementation of custom tasks and loggers to perform specific software construction operations. This extensibility enables the creation of specialized logic to modify build process behavior. The engine manages build automation t

The Meson Build System

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

Osmedeus is a security workflow orchestration engine that coordinates AI agents, shell commands, and scanning tools through declarative YAML pipelines. It functions as a distributed security scanner, a declarative workflow automator, and an AI agent framework for security, enabling automated multi-step security analysis with conditional branching, parallel execution, and distributed workers. The engine distinguishes itself through a hybrid runner model that executes workflow steps on the local host, inside Docker containers, or over SSH to remote machines, selected per step or module. It supp

Moon is a monorepo build system and task runner designed to orchestrate complex projects with multiple packages. It functions as a dependency graph orchestrator that executes build targets in topological order and utilizes input hashing to cache results and skip redundant work. The project features a polyglot toolchain manager that automates the installation and versioning of language runtimes and CLI tools to ensure environment consistency. It also includes a plugin framework based on WebAssembly, allowing developers to extend build logic and toolchain behavior using any supported language.

Checkov is a static analysis tool and security scanner designed to identify misconfigurations in infrastructure as code, container images, and Kubernetes configurations. It functions as a cloud security posture tool, an SCA vulnerability scanner, and a secret scanning utility to prevent security breaches and version control leaks. The project distinguishes itself through deep graph analysis and variable resolution, allowing it to map relationships between interconnected resources and evaluate the final state of infrastructure attributes. It provides extensibility for defining custom security

This project is a customization framework for developing and maintaining a modified web browser based on the Chromium engine. It provides the core tools necessary for patching, building, and managing a specialized browser across multiple operating systems. The framework features a semantic patching toolset designed to apply version-aware code changes to an upstream engine and base project, ensuring compatibility during updates. It also implements a privacy-preserving identity layer that uses blind tokens and custom cryptographic extensions to decouple user payment identities from service usag

Buf is a toolchain for managing the full lifecycle of Protocol Buffers schemas. It provides a set of tools for schema governance, including linting to enforce style guides, a breaking change detector to ensure backward compatibility, and a system for producing language-specific source code via local or remote plugins. The project distinguishes itself through a remote schema registry that centralizes the hosting, versioning, and distribution of Protocol Buffers modules. This registry allows for server-side enforcement of governance policies, such as blocking updates that introduce backward-inc

This repository is the Armbian build framework — an embedded Linux build system for generating custom operating system images tailored to single-board computers, primarily targeting ARM and RISC-V architectures. The build process is orchestrated by GNU Makefiles and relies on a chroot-based environment to assemble the root filesystem, manage cross-compilation toolchains, and aggregate binary firmware blobs for hardware compatibility. Kernel and bootloader source trees are fetched via git, with structured patches applied in a controlled sequence, while each supported board is described by a ded

This project is a Ruby-based package definition repository that functions as a cross-platform package manager and software dependency resolver for macOS and Linux. It provides a centralized system for installing, updating, and managing software through a Git-based distribution model. The system distinguishes itself through a binary package distribution network that produces pre-compiled bottles to avoid local compilation from source. It utilizes a Ruby-based domain specific language to define installation recipes and employs a distributed version control architecture to synchronize these defi

Defold is a cross-platform game engine and integrated development environment used to create 2D and 3D games for desktop, mobile, and web targets. It combines a game development IDE for asset and scene management with a multi-platform build system and a scripting environment based on Lua. The engine includes a specialized headless runtime for hosting game servers and performing automated testing without a graphical interface. It supports native engine extensions, allowing custom low-level code to be integrated into the core to expand functionality beyond the standard scripting interface. The

Piccolo is a mini game engine designed for building small-scale games with cross-platform support. It compiles and runs on Windows, macOS, and Linux from a unified codebase, and includes an editor integration for live editing and debugging. The engine uses a component-based entity system with data-oriented design, storing component data in contiguous arrays for cache-friendly iteration. It features a fixed timestep game loop that decouples simulation updates from rendering frame rate, and provides a physics debug overlay that renders visual shapes from simulation data synchronized with the ed