Top Open Source Projects using CSS

A curated collection of the 521 best open source software using CSS. Find the most popular and trending open source projects to learn from, contribute to, or use in your own projects.

PocketBase

An open source backend in a single Go executable, bundling SQLite, realtime subscriptions, auth, file handling and an admin dashboard.

Alternative to:

AWS Amplify

Open-source backend in a single file

Stars
60,971
Forks
3,673
Last commit
5 days ago

Cherry Studio

A cross-platform desktop client for running many LLM providers and local models side by side, with assistants, documents and MCP support.

Alternative to:

ChatGPT

Multi-model AI desktop client with local-first privacy

Stars

Cal.com

A self-hosted scheduling platform for booking pages and meeting links, built for individuals who want no commercial dependencies.

Alternative to:

Acuity Scheduling

Self-host your own scheduling page, no vendor required

Stars

Gitea

A lightweight self-hosted Git service in Go, bundling code review, issues, wiki, packages and CI for teams running their own forge.

Alternative to:

Bitbucket

Self-hosted Git service for seamless collaboration

Stars
57,852

Appwrite

An all-in-one backend and hosting platform that gives web, mobile and AI teams auth, databases, storage, functions and messaging.

Alternative to:

AWS Amplify

Open-source backend platform for rapid app development

Stars
57,303

Ghost

A headless Node.js CMS for professional, independent publishing, installed through its own CLI and run on your server or hosted.

Alternative to:

Kajabi

Publishing platform for blogs, newsletters, and paid memberships

Stars
55,191

LocalAI

A self-hosted AI engine that runs text, vision, voice, image and video models on any hardware, with no GPU required.

Alternative to:

OpenRouter

Self-hosted AI runtime for text, voice, vision, and agents

Stars
48,940

Aider

A terminal AI pair programmer that edits your local codebase, runs your linters and tests, and commits each change as it goes.

Alternative to:

Cursor

AI pair programmer that works inside your terminal

Stars
48,798

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

Penpot

A design and prototyping platform for product teams, self-hostable and built on open web standards rather than a proprietary format.

Alternative to:

Framer

Open-source UI design and prototyping for product teams

Stars
59,676

LibreChat

A self-hosted chat interface that puts every model provider, agent, tool and file workflow behind one familiar conversation UI.

Alternative to:

ChatGPT

One interface for all your AI models and conversations

Stars
42,875

Puter

A self-hostable desktop environment in the browser, with everyday apps for users and cloud, AI and storage APIs for developers.

Alternative to:

Dropbox

A full desktop environment that runs in your browser

Stars
43,424

Bruno

An offline API client that stores collections as plain text files in your repository, so Git handles versioning and team sharing.

Alternative to:

Postman

Lightweight, fast, and open-source API client for developers

Stars
46,791

Rocket.Chat

A self-hosted communications platform for organizations with strict data protection needs, covering messaging, voice, federation and customer conversations.

Alternative to:

Slack

Self-hosted team messaging with voice, video, and AI

Stars

Tldraw

A React SDK for building infinite canvas apps, shipping a whiteboard out of the box and custom shapes when you need them.

Alternative to:

Miro

Free instant whiteboard with real-time collaboration

Stars
50,179

Mastodon

A federated social network server on ActivityPub, letting anyone run a community that still talks to the wider fediverse.

Alternative to:

Threads

Decentralized social networking in your control

Stars
50,274

Hyperswitch

Modular payments infrastructure that routes transactions across more than 120 processors, for teams that want to own their payment stack.

Alternative to:

Dodo Payments

Open source payment orchestrator for global transactions

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

Open-Notebook

A self-hosted research notebook and Notebook LM alternative for people who want to pick their own AI models and keep sources private.

Alternative to:

NotebookLM

AI-powered research notebook with full privacy control

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

Agno

Python framework and runtime for building agent platforms, serving them as an API and managing them through a web control plane.

Alternative to:

Microsoft Copilot Studio

Model-agnostic platform for building intelligent AI agents

Stars

Discourse

Open source community platform for forums, real-time chat and discussion, aimed at organizations that want to run their own site.

Alternative to:

Invision Community

Cultivate vibrant online communities with ease

Stars

Metabase

Business intelligence tool that lets anyone on a team ask questions of company data and build dashboards without writing SQL.

Alternative to:

Looker

Unlock data insights with powerful, user-friendly analytics

Stars
49,110

Payload

Next.js native headless CMS that installs into an existing app folder, giving developers a TypeScript backend and an extensible React admin.

Alternative to:

Contentful

Headless CMS for developers, built with Node.js

Stars
44,601

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

SiYuan

Privacy-first knowledge management app built on content blocks, with Markdown WYSIWYG editing, two-way links and local or Docker hosted storage.

Alternative to:

Notion

Privacy-first knowledge management with block-level linking

Stars
46,203

ToolJet

Open source platform for building internal tools, admin panels and dashboards on top of existing databases, APIs and SaaS systems.

Alternative to:

Retool

Build internal tools rapidly without coding

Stars
40,858

Gogs

Lightweight self-hosted Git service written in Go, shipping as a single binary that runs comfortably on very modest hardware.

Alternative to:

Bitbucket

Self-hosted Git service that's lightweight and easy to install

Stars
47,807

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

Dokploy

Self-hostable platform as a service that deploys applications and databases on your own VPS, with Docker Swarm and Traefik underneath.

Alternative to:

Vercel

Effortless deployment and management for any VPS

Stars
37,131

drawDB

Browser-based database diagram editor that builds entity relationship models, imports and exports SQL and generates migrations without an account.

Alternative to:

Lucidchart

Design database diagrams and generate SQL scripts instantly

Stars
39,364

Postiz

Self-hostable social media scheduling tool with analytics, team collaboration and an API, covering platforms like X, Bluesky, Mastodon and Discord.

Alternative to:

Buffer

Schedule, analyze, and manage 30+ social media accounts

Stars
35,562

CopilotKit

SDK for developers building agent-native apps, adding chat, generative UI, shared state and human-in-the-loop across web, mobile and chat platforms.

Alternative to:

Voiceflow

Build AI copilots for your product in hours, not months

Stars

Continue

Coding agent for VS Code, JetBrains and the terminal, now shipped as a final version and no longer under active development.

Alternative to:

Cursor

Open-source coding agent for your IDE and terminal

Stars
35,812

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Top Open Source Projects using CSS

A curated collection of the 521 best open source software using CSS. Find the most popular and trending open source projects to learn from, contribute to, or use in your own projects.

PocketBase

Cherry Studio

Cal.com

Gitea

Appwrite

Ghost

LocalAI

Aider

Joplin

Penpot

LibreChat

Puter

Bruno

Rocket.Chat

Tldraw

Mastodon

Hyperswitch

Zen Browser

Open-Notebook

Jan

Agno

Discourse

Metabase

Payload

Buzz

SiYuan

ToolJet

Gogs

Logseq

Dokploy

drawDB

Postiz

CopilotKit

Continue

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