Open Source Index
Curated list of the most critical open source projects powering our modern digital infrastructure, measured by contributor volume and software value
| Project | Contributors | Software value | Health score |
|---|---|---|---|
KubernetesKubernetes (K8s) is an open-source system for automating deployment, scaling, and management of containerized applications. | 122,064 | $4.6B | Excellent |
Agent2Agent (A2A) ProtocolAn open protocol enabling communication and interoperability between opaque agentic applications. | 574 | $262K | Excellent |
NixOSNixOS is a declarative, reproducible Linux distribution built around the Nix package manager, where the entire system configuration—including packages, services, and settings—is defined in a single configuration file. | 27,500 | $137M | Excellent |
OpenTelemetryOpenTelemetry makes robust, portable telemetry a built-in feature of cloud-native software. OpenTelemetry provides a single set of APIs, libraries, agents, and collector services to capture distributed traces and metrics from your application. You can analyze them using Prometheus, Jaeger, and other observability tools. | 24,851 | $234M | Excellent |
Raspberry Pi KernelKernel source tree for Raspberry Pi-provided kernel builds. | 15,010 | $1.2B | Excellent |
Cloud Foundry Foundation (CFF)Cloud Foundry is the industry-standard open source cloud application platform for developing and deploying enterprise cloud applications. | 1,173 | - | Excellent |
Gemini CLIAn open-source AI agent that brings the power of Gemini directly into your terminal. | 5,762 | $5.6M | Excellent |
HieroA blockchain-based ledger system focused on environmental and ecological applications | 1,919 | $102M | Excellent |
LFX CDPLFX Community Data Platform | 673 | $7.9M | Excellent |
The web-platform-tests ProjectA comprehensive test suite and framework for verifying web platform feature implementations across browsers. It provides a collection of tests for web standards and specifications to ensure cross-browser compatibility and conformance to W3C/WHATWG standards. | 5,526 | $220M | Excellent |
Zephyr ProjectThe Zephyr Project is a scalable real-time operating system (RTOS) supporting multiple hardware architectures, optimized for resource constrained devices, and built with safety and security in mind. | 15,746 | $139M | Excellent |
vLLMThe mission of the Project is to develop an open-source library for fast LLM inference and serving. | 17,406 | $23M | Excellent |
Apache ArrowApache Arrow is a cross-language development platform for in-memory columnar data and analytics. It defines a standardized language-independent columnar memory format for flat and hierarchical data, enabling efficient data interchange between systems and zero-copy reads for data processing. | 5,231 | $37M | Excellent |
FINOS (The Fintech Open Source Foundation)FINOS’ mission is to promote open innovation in financial services | 3,858 | $1.4M | Excellent |
KubeVirtKubeVirt technology addresses the needs of development teams that have adopted or want to adopt Kubernetes but possess existing Virtual Machine-based workloads that cannot be easily containerized. More specifically, the technology provides a unified development platform where developers can build, modify, and deploy applications residing in both Application Containers as well as Virtual Machines in a common, shared environment. | 3,298 | $2.6B | Excellent |
OpenSSLTLS/SSL and crypto library | 9,436 | $42M | Excellent |
CalypsoCalypso is a modern JavaScript-based interface for WordPress.com that provides a fast and seamless experience for managing WordPress sites and content through a unified dashboard | 3,576 | $54M | Excellent |
ConnectConnect is a simple, cross-language framework for Protobuf RPC. | 3,883 | $5.6M | Excellent |
DartDart is a client-optimized programming language developed by Google for building fast apps on multiple platforms. It compiles to native code for mobile and desktop, and to JavaScript for the web. | 6,888 | $182M | Excellent |
Definitely TypedDefinitelyTyped is a community-driven project that provides high-quality TypeScript type definitions for JavaScript libraries. | 31,521 | $110M | Excellent |