Chamilo

Open-source e-learning platform trusted by 30M+ users worldwide

Chaskiq

Full-featured messaging platform for marketing, support, and sales

Chatbox

Desktop AI client for ChatGPT, Claude, and local LLMs

ChatterBot

Machine learning conversational dialog engine built in Python

Chatwoot

Open-source customer support platform with omnichannel inbox and AI

chDB

In-process SQL OLAP engine powered by ClickHouse

CheckCle

Real-time full-stack monitoring platform for servers, apps, and services

Checkmate

Self-hosted uptime and infrastructure monitoring with real-time alerts

Checkmk

Unified monitoring for servers, containers, and cloud workloads

Checkstyle

Enforce Java coding standards automatically across your codebase

Chef Infra

Automate infrastructure configuration at scale with Chef Infra

Cherry Studio

Desktop AI client supporting multiple LLM providers cross-platform

Chhoto URL

Blazingly fast, lightweight self‑hosted URL shortener with built‑in analytics

Chroma

Embedding database for building LLM apps with memory

ChuanhuChatGPT

Lightweight web UI for ChatGPT and multiple LLMs

Cilium

eBPF-based networking, observability, and security for Kubernetes

Cinny

Simple, elegant Matrix client for modern instant messaging

CISO Assistant

Unified GRC platform decoupling compliance from cybersecurity controls

CKAN

Powerful platform for publishing, sharing, and managing open data

Clair

Transparent vulnerability scanning for container images using static analysis

Clarity

Privacy‑first, high‑performance behavioral analytics for modern web

Claroline Connect

Open Source Learning Management System Built with Symfony and React

ClassroomIO

Open Source Learning Management System for Modern Training

Claudable

Build Next.js apps instantly with AI-powered code generation