GCC: open-source programming language

Judgement

What it is: Developer tool
What it does: A read-only mirror of GCC, the GNU Compiler Collection for C, C++, Fortran, Ada, Go and other languages.
Adopt it when: You need the GCC source; most users install GCC from their system's packages.
Watch out: A mirror only; development happens on GCC's own infrastructure.
Ready for: Production-ready
Runs as: Command line
Built with: C++ and C
How established: Established: started 12 years ago, no tagged release yet.
What the license allows: Use inside your business is unrestricted, but anything you distribute that includes it must be released under the same license.

Judged on 2026-11-03 from the project's README and GitHub data. The license and age lines are worked out directly.

Built from

LLVM project

Follow it down: GCC → LLVM project → runs on a microchip

How compilers were built, back to punched paper tape

Built on GCC: 86 projects

1
Ollama ollama
Get up and running with Kimi, GLM, MiniMax, DeepSeek, gpt-oss, Qwen, Gemma and other models.

Developer tool Production-ready You want to run local LLMs for development, privacy or offline use with minimal setup.
★ 186k MIT Go Active, pushed today
2
Llama.cpp ggml-org
LLM inference in C/C++

Building block Production-ready You need efficient local or edge LLM inference and want the engine many other tools are built on.
★ 133k MIT C++ Active, pushed today
3
Hugo gohugoio
The world’s fastest framework for building websites.

Developer tool Production-ready You want a fast, dependency-free generator for docs, blogs or marketing sites with thousands of pages.
★ 90k Apache-2.0 Go Active, pushed today
4
Netdata netdata
The fastest path to AI-powered full stack observability, even for lean teams.

Complete system Production-ready You want detailed server and container monitoring running within minutes without building Prometheus and Grafana yourself.
★ 81k GPL-3.0 Go Active, pushed today
5
OBS Studio obsproject
OBS Studio - Free and open source software for live streaming and screen recording

Complete system Production-ready You record tutorials or stream to Twitch, YouTube and similar platforms.
★ 79k GPL-2.0 C Active, pushed today
6
CPython python
The Python programming language

Developer tool Production-ready You write Python, or need to build, embed or contribute to the interpreter itself.
★ 78k See repository Python Active, pushed today
7
Redis redis
For developers, who are building real-time data-driven applications, Redis is the preferred, fastest, and most feature-rich cache, data structure server, and document and vector query engine.

Building block Production-ready You need very fast caching, counters, queues or pub/sub next to your main database.
★ 77k See repository C Active, pushed today
8
Julia JuliaLang
The Julia Programming Language

Developer tool Production-ready You do scientific computing, simulation or numerical work where Python is too slow and C is too painful.
★ 49k MIT Julia Active, pushed today
9
Php-src php
The PHP Interpreter

Developer tool Production-ready You build or host PHP applications, or need to build PHP or its extensions from source.
★ 42k BSD-3-Clause C Active, pushed today
10
V vlang
Simple, fast, safe, compiled language for developing maintainable software. Compiles itself in <1s with zero library dependencies. Supports automatic C => V translation. https://vlang.io

Developer tool Experimental You want to experiment with a new systems language for hobby projects.
★ 38k MIT V Active, pushed today
11
Raylib raysan5
A simple and easy-to-use library to enjoy videogames programming

Framework or platform Production-ready You want to learn game programming or build small games and tools with a minimal API.
★ 36k Zlib C Active, pushed yesterday
12
NumPy numpy
The fundamental package for scientific computing with Python.

Building block Production-ready You do any numerical, scientific or data work in Python.
★ 33k See repository Python Active, pushed today
13
NGINX nginx
The official NGINX Open Source repository.

Building block Production-ready You need a fast, proven web server or reverse proxy in front of your applications.
★ 32k BSD-2-Clause C Active, pushed 4 days ago
14
Valkey valkey-io
A flexible distributed key-value database that is optimized for caching and other realtime workloads.

Building block Production-ready You want Redis-compatible caching under a permissive open-source license, or your cloud provider offers it as the default.
★ 28k BSD-3-Clause C Active, pushed today
15
Typesense typesense
Open Source alternative to Algolia + Pinecone and an Easier-to-Use alternative to ElasticSearch ⚡ 🔍 ✨ Fast, typo tolerant, in-memory fuzzy Search Engine for building delightful search experiences

Building block Production-ready You want Algolia-style instant search for a site or app that you can self-host cheaply.
★ 27k GPL-3.0 C++ Active, pushed 3 days ago
16
TDengine taosdata
High-performance, scalable time-series database designed for Industrial IoT (IIoT) scenarios

Building block Production-ready You collect data from many devices and need efficient storage with a table-per-device model.
★ 25k AGPL-3.0 C Active, pushed today
17
Tasmota arendst
Alternative firmware for ESP8266 and ESP32 based devices with easy configuration using webUI, OTA updates, automation using timers or rules, expandability and entirely local control over MQTT, HTTP, Serial or KNX. Full documentation at

Complete system Production-ready You want cloud-free control of cheap Wi-Fi smart devices and can flash firmware.
★ 25k GPL-3.0 C Active, pushed today
18
Bend bendlang
Bend 2: a fast language that blocks AI mistakes via proof. Install: curl -fsSL https://bend-lang.com/install.sh | sh

Developer tool Experimental You are researching verified or massively parallel programming and want to experiment with a new language.
★ 25k Apache-2.0 TypeScript Active, pushed today
19
Ruby ruby
The Ruby Programming Language

Developer tool Production-ready You build web apps with Rails or want an expressive scripting language.
★ 24k See repository Ruby Active, pushed today
20
Postgres postgres
Mirror of the official PostgreSQL GIT repository. Note that this is just a *mirror* - we don't work with pull requests on github. To contribute, please see https://wiki.postgresql.org/wiki/Submitting_a_Patch

Building block Production-ready You need a general-purpose relational database for almost any application.
★ 23k See repository C Active, pushed today

Open-source alternatives to GCC

1
Go golang
The Go programming language

Developer tool Production-ready You build backend services or command-line tools and value simple code, fast builds and single-binary deploys.
★ 140k BSD-3-Clause Go Active, pushed today
2
Rust rust-lang
Empowering everyone to build reliable and efficient software.

Developer tool Production-ready You need C-level performance with memory safety, for systems software, CLIs, services or WebAssembly.
★ 121k Apache-2.0 Rust Active, pushed today
3
TypeScript microsoft
TypeScript is a superset of JavaScript that compiles to clean JavaScript output.

Developer tool Production-ready You write JavaScript projects of any size and want static types and better editor tooling.
★ 112k Apache-2.0 Go Active, pushed today
4
CPython python
The Python programming language

Developer tool Production-ready You write Python, or need to build, embed or contribute to the interpreter itself.
★ 78k See repository Python Active, pushed today
5
Swift swiftlang
The Swift Programming Language

Developer tool Production-ready You build iOS or macOS apps, or want Swift on Linux servers.
★ 71k Apache-2.0 Swift Active, pushed today
6
Kotlin JetBrains
The Kotlin Programming Language.

Developer tool Production-ready You build Android apps or JVM services and want a more concise, null-safe alternative to Java.
★ 54k See repository Kotlin Active, pushed today
7
Julia JuliaLang
The Julia Programming Language

Developer tool Production-ready You do scientific computing, simulation or numerical work where Python is too slow and C is too painful.
★ 49k MIT Julia Active, pushed today
8
Php-src php
The PHP Interpreter

Developer tool Production-ready You build or host PHP applications, or need to build PHP or its extensions from source.
★ 42k BSD-3-Clause C Active, pushed today