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.
Privacy-first offline maps for hiking, cycling & navigation
Stars
15,157Last commit
11 hours agoLicense
Apache-2.0
Free, open-source offline maps app with detailed trails, turn-by-turn navigation, and zero tracking. Perfect for hikers, cyclists, and travelers seeking privacy.
Open Source Alternative to:
Fast, secure cloud development environments on your infrastructure
Stars
14,214Last commit
10 hours agoLicense
AGPL-3.0
Self-hosted development platform that enables secure, scalable remote coding with automated provisioning, reduced cloud costs, and enterprise-grade security.
Open Source Alternative to:
Advanced terminal with modern features for Mac developers
Stars
17,948Last commit
21 hours agoLicense
GPL-2.0
Feature-rich terminal replacement for macOS with split panes, search, autocomplete, and extensive customization options for enhanced productivity.
Open Source Alternative to:
Minimalistic AI-powered search engine for instant answers
Stars
11,842Last commit
8 days agoLicense
AGPL-3.0
Scira delivers concise, AI-generated responses to queries using a clean interface and powerful search capabilities.
Open Source Alternative to:
Secure cloud environments for enterprise AI agents
Stars
13,490Last commit
11 hours agoLicense
Apache-2.0
Provide AI agents with secure, isolated sandboxes featuring real-world tools, code execution, and enterprise-grade security. Trusted by 88% of Fortune 100 companies.
Open Source Alternative to:
Secure, customizable authentication for your applications
Stars
15,270Last commit
2 days agoLicense
Unknown
Open-source authentication solution offering flexible, self-hosted user management with advanced features and easy integration.
Open Source Alternative to:
Zero-knowledge encrypted notes that sync across all devices
Stars
14,441Last commit
16 hours agoLicense
GPL-3.0
End-to-end encrypted note-taking app with zero-knowledge architecture, cross-device sync, web clipper, and a self-hostable sync server.
Open Source Alternative to:
Secure and streamline database changes with CI/CD automation
Stars
14,406Last commit
10 hours agoLicense
MIT
Comprehensive platform for database schema migrations, security controls, and data masking with built-in review workflows and GitOps integration.
Real-time analytics database for sub-second OLAP queries
Stars
14,044Last commit
21 hours agoLicense
Apache-2.0
Columnar, time-indexed analytics database built for streaming and batch data at scale, handling billions to trillions of rows with millisecond query response times.
Open Source Alternative to:
Centralize, transform, and stash your data
Stars
14,926Last commit
11 hours agoLicense
Unknown
Logstash is a free and open server-side data processing pipeline that ingests data from multiple sources, transforms it, and sends it to your desired destination.
Open Source Alternative to:
Complete production stack for AI teams
Stars
12,777Last commit
3 months agoLicense
MIT
Comprehensive AI platform with gateway, observability, guardrails, and prompt management. Access 1,600+ LLMs via unified API with enterprise-grade security.
Open Source Alternative to:
Build full-stack apps with TypeScript and real-time sync
Stars
12,401Last commit
21 hours agoLicense
Unknown
Open-source reactive database that keeps your web and mobile apps in sync. Write everything in TypeScript with built-in auth, cron jobs, and AI integration.
Open Source Alternative to:
Ultra-fast data transformation for AI with lineage
Stars
11,371Last commit
2 days agoLicense
Apache-2.0
Open-source ETL framework built in Rust for AI workloads. Features incremental processing, data lineage, and observability tools for semantic search and RAG applications.
Open Source Alternative to:
Unify, automate, and elevate your monitoring workflow
Stars
12,230Last commit
17 hours agoLicense
MIT
Open-source platform for centralizing alerts, automating responses, and enhancing incident management across your tech stack.
Open Source Alternative to:
Build beautiful documentation sites with Next.js
Stars
12,943Last commit
13 hours agoLicense
MIT
A flexible Next.js framework for creating stunning documentation sites with MDX support, built-in search, and customizable components.
Open Source Alternative to:
Create powerful chatbots without coding
Stars
10,270Last commit
14 hours agoLicense
Unknown
Design, build, and deploy interactive chatbots with a visual editor. Integrate easily and collect data effortlessly.
Open Source Alternative to:
Open source messaging with privacy and community focus
Stars
10,054Last commit
10 hours agoLicense
AGPL-3.0
Free, open-source instant messaging and VoIP platform with full Markdown support, voice/video calls, moderation tools, and self-hosting options for communities.
Open Source Alternative to:
Your all-in-one marketplace for digital creators and products
Stars
9,604Last commit
10 hours agoLicense
MIT
A digital marketplace platform where creators can sell digital products, from courses to software, with built-in payment processing and content delivery.
Open Source Alternative to:
Unified file management for your enterprise storage
Stars
14,527Last commit
10 hours agoLicense
AGPL-3.0
Filestash is an open-source file manager that integrates with multiple storage backends, authentication systems, and offers customization options.
Open Source Alternative to:
Common layer for composing and governing AI agents
Stars
9,094Last commit
10 hours agoLicense
Apache-2.0
Meta-harness that sits above Claude Code, Codex, and other AI agents to add policy enforcement, sandboxing, and real-time collaborative sessions.
Open Source Alternative to:
AI-Powered Note Taking App
Stars
10,884Last commit
18 days agoLicense
GPL-3.0
The next generation of open-source AI-powered card notes designed to help you quickly capture and organize inspiration so that ideas never run out.
Open Source Alternative to:
Visual database for workflow automation across apps
Stars
15,560Last commit
10 months agoLicense
AGPL-3.0
AITable.ai offers a visual database platform that simplifies workflow automation and connects to over 6,000 apps through integrations like Zapier and Make.
Open Source Alternative to:
AI-powered grammar checker for 30+ languages
Stars
14,840Last commit
13 hours agoLicense
LGPL-2.1
Check grammar, punctuation, and spelling errors instantly with AI-powered technology. Supports 30+ languages with browser extensions and desktop apps.
Open Source Alternative to:
Simple, speedy, and secure link shortener with analytics
Stars
7,033Last commit
16 hours agoLicense
AGPL-3.0
A serverless link shortener that runs entirely on Cloudflare, offering URL compression, analytics, and customizable slugs.
Open Source Alternative to:
Visual editing for your Git-based content
Stars
13,741Last commit
20 hours agoLicense
Apache-2.0
A headless CMS that simplifies content management with real-time editing, Git-based workflows, and developer-friendly customization.
Open Source Alternative to:
Secure, decentralized messaging for teams and individuals
Stars
13,392Last commit
11 hours agoLicense
AGPL-3.0
Open-source platform for encrypted communication, file sharing, and collaboration based on the Matrix protocol.
Open Source Alternative to:
Beautiful open-source monitoring for modern infrastructure
Stars
10,638Last commit
11 hours agoLicense
AGPL-3.0
Monitor servers, websites, Docker containers, and infrastructure with real-time insights, instant alerts, and powerful analytics. Self-hosted solution.
Open Source Alternative to:
Self-hosted session replay with complete data control
Stars
12,531Last commit
18 hours agoLicense
AGPL-3.0
Open-source session replay and product analytics platform you can self-host for complete control over data security, privacy, and compliance.
Open Source Alternative to:
Self-hosted Kanban board with real-time collaboration
Stars
12,424Last commit
10 days agoLicense
Unknown
Self-hosted Kanban board for agile teams. Unlimited boards, real-time sync, GDPR-compliant, and available as a free Community Edition or paid Pro.
Open Source Alternative to:
Open-source LLM tracing & evaluation for AI optimization
Stars
11,129Last commit
10 hours agoLicense
Elastic-2.0
Open-source platform for LLM tracing, evaluation, and optimization. Features automatic instrumentation, prompt playground, and real-time AI application monitoring.
Open Source Alternative to:
Open-source integration platform for seamless workflows
Stars
13,938Last commit
6 months agoLicense
Unknown
Self-hosted automation tool that connects your apps and services, enabling powerful integrations and efficient data flow across your ecosystem.
Open Source Alternative to:
AI-powered answer engine with dynamic interface generation
Stars
9,051Last commit
1 day agoLicense
Apache-2.0
Open-source answer engine that dynamically generates UI components while providing AI-powered responses, combining conversational AI with interactive interfaces.
Open Source Alternative to:
Feature flags for rapid, risk-free software deployment
Stars
13,747Last commit
13 hours agoLicense
AGPL-3.0
A powerful feature management platform enabling gradual rollouts, A/B testing, and seamless integration for continuous delivery.
Open Source Alternative to:
Private meeting notes, no bots, files you own
Stars
9,104Last commit
10 hours agoLicense
MIT
Records system audio without joining your call, then turns rough notes into editable summaries. Audio, transcripts, and notes stay as local files.
Open Source Alternative to:
AI-powered PIM for managing product catalogs at scale
Stars
10,852Last commit
12 hours agoLicense
MIT
Open source Product Information Management system with an AI agent for catalog enrichment, bulk updates, multilingual content, and omnichannel distribution.
Open Source Alternative to:
Build product integrations with 500+ APIs in hours
Stars
11,521Last commit
10 hours agoLicense
Elastic-2.0
Complete integrations platform with 500+ pre-built APIs, code-first approach, unified data models, and enterprise-grade security. Free tier available.
Open Source Alternative to:
Flexible spreadsheets with database power
Stars
11,549Last commit
12 hours agoLicense
Apache-2.0
A versatile data management platform combining spreadsheet simplicity with relational database capabilities for efficient data organization and analysis.
Open Source Alternative to:
Advanced automated status page for real-time monitoring
Stars
11,866Last commit
3 days agoLicense
Apache-2.0
A highly customizable monitoring solution that provides automated status pages, extensive alerting options, and detailed testing capabilities for your services and infrastructure
Open Source Alternative to:
Realtime client-side database for collaborative apps
Stars
10,394Last commit
1 day agoLicense
Apache-2.0
Instant is a database solution for building real-time and offline-enabled applications, simplifying the development of collaborative products.
Open Source Alternative to:
Professional RAW photo editing and workflow management
Stars
12,966Last commit
1 day agoLicense
GPL-3.0
Open source photography workflow application for RAW development. Non-destructive editing, professional color management, and GPU acceleration for photographers.
Open Source Alternative to:
Lightning-fast search for massive datasets
Stars
11,531Last commit
16 hours agoLicense
Apache-2.0
High-performance search engine designed for big data, offering scalability, real-time indexing, and cost-effective operations.
Open Source Alternative to:
The personal finance app for everyone
Stars
9,545Last commit
15 hours agoLicense
AGPL-3.0
An all-in-one personal finance platform. Track, optimize, grow, and manage your money through every stage of life.
Open Source Alternative to:
CodeRabbit – The leading AI Code Review platform. Ship better quality code in 50% less time, with 90% fewer bugs.
Stellar Hosted
Sevalla
Sent