Top Open Source Projects using C

A curated collection of the 92 best open source software using C. Find the most popular and trending open source projects to learn from, contribute to, or use in your own projects.

OpenClaw

An open source AI assistant that runs on your own hardware and reaches you through Discord, Slack, WhatsApp and other chat channels.

Alternative to:

ChatGPT

An AI assistant that acts, not just answers

Stars
389,062
Forks
81,758
Last commit
5 days ago

Hermes Agent

A self-improving agent from Nous Research that learns skills, keeps memory across sessions and reaches you on any chat platform.

Alternative to:

ChatGPT

Desktop AI agent with persistent memory across platforms

Stars
242,618

RustDesk

A remote desktop tool written in Rust that works without configuration and lets you run your own rendezvous and relay servers.

Alternative to:

AnyDesk

Self-hosted remote desktop you fully control

Stars
122,789

pi

A self-extensible terminal coding agent published as TypeScript packages covering the agent runtime, a multi-provider LLM API and a terminal UI.

Alternative to:

GitHub Copilot

Minimal terminal coding agent you can fully customize

Stars
102,470

Godot

A free 2D and 3D game engine with a unified editor and one-click export to desktop, mobile, web and console targets.

Alternative to:

Unity

Free 2D and 3D game engine for cross-platform projects

Stars
116,724

Immich

A self-hosted photo and video backup service with mobile apps, facial recognition and search across metadata, objects and faces.

Alternative to:

Apple iCloud Photos

Self-hosted photo and video backup for your own server

Stars

Paperclip

A self-hosted control plane that gives teams of AI agents an org chart, budgets, approvals and audit trails from one dashboard.

Alternative to:

Lindy

Org chart, budgets, and governance for AI agent teams

Supabase

A Postgres development platform bundling authentication, generated APIs, realtime, storage and vectors, available hosted or entirely self-hosted.

Alternative to:

AWS Amplify

Postgres-powered backend platform for production apps

Stars

Zed

High-performance multiplayer code editor from the creators of Atom and Tree-sitter, for developers on macOS, Linux and Windows.

Alternative to:

Cursor

High-performance code editor built for speed and AI

Stars
89,864

Neovim

A refactored Vim for developers who want an extensible terminal editor with a scriptable API and modern graphical front ends.

Alternative to:

Sublime Text

Vim fork focused on extensibility and usability

Stars
102,212

GPT4All

Desktop chat application that runs large language models locally on ordinary laptops, with no API calls and no GPU required.

Alternative to:

ChatGPT

Run open-source AI models privately on your own device

Stars
77,380

AppFlowy

AI workspace for notes, wikis and projects that keeps your data on your own machine or server, an alternative to Notion.

Alternative to:

Notion

AI workspace for docs, projects, and wikis you control

Stars
76,366

Affine

An all-in-one workspace merging documents, whiteboards and databases, built local-first for teams that want to own their knowledge base.

Alternative to:

Notion

Docs, whiteboards, and databases in one privacy-first workspace

Stars
72,242

AnythingLLM

An all-in-one AI application for chatting with your own documents, running agents and serving multiple users from a private instance.

Alternative to:

ChatGPT

Chat with your documents using any LLM, fully private

Stars
65,736

OBS Studio

Free and open source software for capturing, compositing, encoding, recording and streaming video, used by streamers and anyone recording a screen.

Alternative to:

Bandicam

Free, open-source software for video recording and live streaming

Stars

Warp

An agentic development environment grown out of the terminal, for developers who drive coding agents rather than typing every command.

Alternative to:

Cursor

A modern terminal built around AI coding agents

Stars
64,843

Ghostty

A terminal emulator that refuses the tradeoff between speed, features and native interfaces, with an embeddable library underneath.

Alternative to:

Warp

Fast GPU-accelerated terminal with native UI design

Stars
60,786

Joplin

An offline-first note and to-do app in Markdown, synced with end-to-end encryption across desktop, mobile and the cloud you choose.

Alternative to:

Evernote

Encrypted note-taking that syncs across all your devices

Stars
56,260

ClickHouse

An open source column-oriented SQL database for online analytical processing, built for complex queries over billions of rows in real time.

Alternative to:

Azure Data Explorer

Lightning-fast analytics for massive datasets

Stars

Zen Browser

A Firefox-based browser built around workspaces, split view and a compact interface, aimed at people who keep too many tabs open.

Alternative to:

Google Chrome

Privacy-focused browser with powerful customization

Stars

Jan

Desktop app for downloading and running open source LLMs locally, with optional cloud model access and an OpenAI compatible local server.

Alternative to:

ChatGPT

Run AI models locally or connect to cloud, privately

Stars
44,366

Milvus

Distributed vector database for AI applications, built to search billions of embeddings with metadata filtering, hybrid queries and hardware acceleration.

Alternative to:

Pinecone

High-performance vector database for GenAI applications

Stars
46,004

Buzz

Self-hostable workspace where people and AI agents share the same channels, built on a Nostr relay with a signed event log.

Alternative to:

Slack

Team chat, project management, and AI agents in one place

Logseq

Privacy-first outliner for knowledge management and collaboration, storing notes as local Markdown or Org-mode files you keep control of.

Alternative to:

Notion

Privacy-first knowledge base that connects your notes

Stars
44,802

PostHog

Product analytics suite bundling events, session replays, feature flags, experiments, surveys and error tracking into one platform for product teams.

Alternative to:

Google Analytics

Unlock Product Insights with Open-Source Analytics

Stars

Spacedrive

Cross-device file manager that indexes local disks, clouds and external sources into one searchable library synced directly between your machines.

Alternative to:

ForkLift

Your personal distributed filesystem

Stars
38,913

Handy

Offline speech-to-text desktop app where you hold a shortcut, speak, and the transcription lands in whatever text field has focus.

Alternative to:

Aqua Voice

Press a key, speak, release. Text appears instantly.

Stars
31,118

FastGPT

AI agent building platform with knowledge bases and visual workflow orchestration, for teams shipping retrieval backed assistants without writing glue code.

Alternative to:

Voiceflow

Build powerful AI knowledge bases with ease

Stars
29,591

Insomnia

Cross-platform API client for REST, GraphQL, gRPC and WebSockets, for developers who want to design, test and mock in one app.

Alternative to:

Postman

Powerful API development and testing made effortless

Stars
39,999

T3 Code

A control surface for the coding agents already installed on your machine, reachable from a desktop, web or mobile app.

Alternative to:

Omnara

AI-powered coding made simple and efficient

Qdrant

Alternative to:

Pinecone

Fast, scalable vector database for AI applications

Stars
34,411

Jitsi

A set of open source projects for running video conferences in the browser, self-hosted or on a free public instance.

Alternative to:

Microsoft Teams

Private, secure video calls with no account needed

Stars
29,884

Netbird

WireGuard-based overlay network with centralized access control, connecting machines peer to peer without open ports or VPN gateways.

Alternative to:

Cloudflare One

Zero Trust networking with WireGuard-based secure connectivity

Stars

Dyad

Local AI app builder that runs on your own machine with your own model keys, for developers avoiding hosted prompt-to-app tools.

Alternative to:

Build unlimited AI apps locally with zero vendor lock-in

Stars
21,389

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Top Open Source Projects using C

A curated collection of the 92 best open source software using C. Find the most popular and trending open source projects to learn from, contribute to, or use in your own projects.

OpenClaw

Hermes Agent

RustDesk

pi

Godot

Immich

Paperclip

Supabase

Zed

Neovim

GPT4All

AppFlowy

Affine

AnythingLLM

OBS Studio

Warp

Ghostty

Joplin

ClickHouse

Zen Browser

Jan

Milvus

Buzz

Logseq

PostHog

Spacedrive

Handy

FastGPT

Insomnia

T3 Code

Qdrant

Jitsi

Netbird

Dyad

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