Open Source Projects using CSS
A curated collection of the 580 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.
Cultivate vibrant online communities with ease
Stars
47,685Last commit
10 hours agoLicense
GPL-2.0
A powerful, customizable platform for building and managing online forums, fostering engaging discussions and collaborative spaces.
Open Source Alternative to:
High-performance vector database for GenAI applications
Stars
45,713Last commit
10 hours agoLicense
Apache-2.0
Open-source vector database optimized for similarity search, scaling to billions of vectors with minimal performance loss
Open Source Alternative to:
Headless CMS for developers, built with Node.js
Stars
44,291Last commit
10 hours agoLicense
MIT
A powerful, flexible, and developer-friendly content management system that prioritizes customization and scalability.
Open Source Alternative to:
Build internal tools rapidly without coding
Stars
40,589Last commit
11 hours agoLicense
AGPL-3.0
Open-source low-code platform for creating custom internal tools, dashboards, and admin panels with a drag-and-drop interface
Open Source Alternative to:
Privacy-first knowledge base that connects your notes
Stars
44,532Last commit
10 hours agoLicense
AGPL-3.0
Local-first, open-source knowledge management tool with bidirectional linking, outlines, flashcards, PDF annotations, and whiteboards for building a connected second brain.
Open Source Alternative to:
Design database diagrams and generate SQL scripts instantly
Stars
39,182Last commit
4 days agoLicense
AGPL-3.0
Free online database diagram editor with SQL generation. Create ER diagrams, visualize relationships, export scripts, and reverse engineer schemas - no signup required.
Open Source Alternative to:
Effortless deployment and management for any VPS
Stars
36,741Last commit
11 hours agoLicense
Unknown
Streamline your deployment process with Dokploy. Manage applications and databases on any VPS using Docker and Traefik for improved performance and security.
Open Source Alternative to:
Build AI copilots for your product in hours, not months
Stars
36,892Last commit
9 hours agoLicense
MIT
Integrate production-ready AI copilots into any product quickly and easily with CopilotKit's open-source platform.
Open Source Alternative to:
Comprehensive business management, tailored for you
Stars
38,311Last commit
11 hours agoLicense
GPL-3.0
Open-source ERP solution offering modules for accounting, inventory, HR, CRM, and more. Customizable and scalable for businesses of all sizes.
Open Source Alternative to:
Empower your website with privacy-focused analytics
Stars
38,287Last commit
10 hours agoLicense
MIT
A lightweight, open-source alternative to Google Analytics that respects user privacy and provides valuable insights.
Open Source Alternative to:
Open-source coding agent for your IDE and terminal
Stars
35,560Last commit
17 hours agoLicense
Apache-2.0
Runs source-controlled AI checks on every pull request, enforcing your engineering standards as native GitHub status checks with suggested fixes.
Open Source Alternative to:
Visual builder for AI agents and LLM workflows
Stars
55,385Last commit
8 days agoLicense
Apache-2.0
Open source platform for building AI agents, chatbots, and multi-agent systems using a drag-and-drop interface, with support for 100+ LLMs and RAG.
Open Source Alternative to:
Empower your team to build custom internal tools rapidly
Stars
40,710Last commit
12 hours agoLicense
Apache-2.0
Low-code platform for creating powerful internal tools and dashboards with drag-and-drop ease, robust integrations, and customizable workflows.
Open Source Alternative to:
Manage Linux servers with ease through a modern web interface
Stars
36,584Last commit
17 hours agoLicense
GPL-3.0
Comprehensive web-based tool for Linux server administration with integrated website, database, container, and LLM management capabilities.
Open Source Alternative to:
Team chat, project management, and AI agents in one place
Stars
28,858Last commit
9 hours agoLicense
Apache-2.0
Workspace that combines team chat, project planning, and git management with AI agents that collaborate alongside your team on shared context.
Open Source Alternative to:
Open source LLM engineering platform for AI-powered applications
Stars
33,471Last commit
9 hours agoLicense
MIT
Langfuse provides tracing, evaluations, prompt management, and analytics to debug and improve LLM applications.
Open Source Alternative to:
Secure collaboration platform for mission-critical work
Stars
38,849Last commit
10 hours agoLicense
Unknown
Mattermost provides a flexible, open-source platform for secure team collaboration, designed for organizations with strict security and privacy requirements.
Open Source Alternative to:
Unlock Product Insights with Open-Source Analytics
Stars
37,913Last commit
9 hours agoLicense
MIT
All-in-one product analytics platform. Track user behavior, run experiments, and make data-driven decisions to grow your product.
Open Source Alternative to:
Real-time error tracking and performance monitoring
Stars
44,581Last commit
9 hours agoLicense
Unknown
Detect, diagnose, and resolve software issues quickly with powerful error tracking, performance monitoring, and release management.
Open Source Alternative to:
Unified AI-powered enterprise search across company data
Stars
31,688Last commit
10 hours agoLicense
MIT
An open-source platform that connects to 40+ apps to provide intelligent search and AI assistance across all company information
Open Source Alternative to:
Cut and trim video without re-encoding or quality loss
Stars
43,068Last commit
1 day agoLicense
GPL-2.0
Desktop app for lossless video and audio editing. Cut, trim, merge, and remux files in seconds without re-encoding, using FFmpeg under the hood.
Open Source Alternative to:
Your personal distributed filesystem
Stars
38,799Last commit
23 days agoLicense
AGPL-3.0
A cross-platform file manager that unifies your devices into a seamless, organized digital workspace.
Open Source Alternative to:
AI second brain for research, automation, and personal agents
Stars
36,603Last commit
19 days agoLicense
AGPL-3.0
Self-hostable AI assistant that connects to your docs and the web, lets you build agents, schedule automations, and run research with verifiable citations.
Open Source Alternative to:
Open-source e-commerce for modern developers
Stars
35,924Last commit
9 hours agoLicense
MIT
Flexible, customizable e-commerce platform with headless architecture, built-in features, and extensive plugin ecosystem for scalable online stores.
Open Source Alternative to:
Build powerful AI knowledge bases with ease
Stars
29,406Last commit
17 hours agoLicense
Unknown
FastGPT is a free, open-source platform for creating AI-powered knowledge bases with data processing, model invocation, and visual workflows.
Open Source Alternative to:
Press a key, speak, release. Text appears instantly.
Stars
29,997Last commit
2 days agoLicense
MIT
Cross-platform desktop app that transcribes your voice into any text field using a keyboard shortcut, with all processing done locally on your machine.
Open Source Alternative to:
Craft rich text experiences with ease
Stars
38,097Last commit
11 hours agoLicense
MIT
A customizable, open-source rich text editor framework for modern web applications, built on Vue and Prosemirror
Secure authentication and access control made simple
Stars
36,312Last commit
9 hours agoLicense
Apache-2.0
Comprehensive open source identity management solution offering single sign-on, social login, and fine-grained authorization for applications and services.
Open Source Alternative to:
AI coding agent for VS Code, JetBrains, CLI, and Cloud
Stars
26,945Last commit
10 hours agoLicense
MIT
Open source AI coding agent with 500+ models, bring-your-own-key support, and specialized modes for writing, debugging, and planning code across IDEs and CLI.
Open Source Alternative to:
Powerful API development and testing made effortless
Stars
39,957Last commit
11 hours agoLicense
Apache-2.0
Intuitive API client for REST, GraphQL, and gRPC. Debug, test, and collaborate on APIs with ease across platforms.
Open Source Alternative to:
Powerful screen capture and file sharing tool for Windows
Stars
39,220Last commit
23 hours agoLicense
GPL-3.0
ShareX is a free, open-source program that captures or records any area of your screen and shares it with a single keypress, supporting various file types and destinations.
Open Source Alternative to:
Secure cloud collaboration platform for organizations
Stars
36,497Last commit
9 hours agoLicense
AGPL-3.0
Nextcloud offers on-premises file sync, sharing and collaboration platform with advanced security and privacy features.
Open Source Alternative to:
Zero-config VPN with WireGuard for secure networking
Stars
35,397Last commit
12 hours agoLicense
BSD-3-Clause
Deploy a modern WireGuard-based VPN with zero configuration. Connect devices securely across clouds, VPCs, and on-premises networks without firewall rules.
Open Source Alternative to:
Framework-agnostic authentication for TypeScript applications
Stars
29,609Last commit
10 hours agoLicense
MIT
A comprehensive authentication framework offering email/password, social sign-on, two-factor auth, and multi-tenant support with full TypeScript integration.
Open Source Alternative to:
Local AI meeting transcription with zero data leaving your device
Stars
29,621Last commit
3 months agoLicense
MIT
Records, transcribes, and summarizes meetings entirely on your device using local AI. No bots, no cloud uploads, GDPR and HIPAA compliant by design.
Open Source Alternative to:
AI-powered code completion for seamless development
Stars
33,833Last commit
2 months agoLicense
Apache-2.0
Self-hosted AI coding assistant that enhances productivity with context-aware suggestions and privacy-focused implementation.
Open Source Alternative to:
Open-source data platform for effortless content management
Stars
37,455Last commit
11 hours agoLicense
Unknown
A versatile headless CMS and API engine that simplifies data management, content creation, and application development.
Open Source Alternative to:
Organize terminal sessions with built-in layouts, tabs, and panes
Stars
35,012Last commit
18 hours agoLicense
MIT
A terminal multiplexer that organizes your workflow with intuitive layouts, tabs, and panes. Includes batteries for seamless terminal workspace management.
Open Source Alternative to:
Build data-rich React apps with ease and flexibility
Stars
35,547Last commit
3 months agoLicense
MIT
A React-based framework for rapid development of internal tools, admin panels, and dashboards with powerful data handling capabilities.
Open Source Alternative to:
Track your net worth across accounts and assets
Stars
54,321Last commit
1 year agoLicense
AGPL-3.0
Personal finance tracker that consolidates accounts, investments, and assets into a single net worth dashboard with goal tracking and projections.
Open Source Alternative to:
Open-source vector database for AI search and retrieval
Stars
29,107Last commit
9 hours agoLicense
Apache-2.0
Open-source vector database designed for AI applications. Store, search, and retrieve embeddings with semantic similarity matching and metadata filtering.
Open Source Alternative to:
Save links, notes, and images. AI tags them for you.
Stars
28,488Last commit
4 days agoLicense
AGPL-3.0
Self-hostable bookmark manager that saves links, notes, images, and PDFs, then automatically tags and organizes them using AI for faster retrieval.
Open Source Alternative to:
c15t – Open-source cookie banner, built for control and lightening fast modern web apps.
c15t
Sent
InfluxDB