Open Source Projects using CSS
A curated collection of the 629 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.
Time-series database and historian for industrial data
Stars
25,171Last commit
1 day agoLicense
AGPL-3.0
High-performance time-series database with industrial data management, built-in stream analytics, and AI-driven anomaly detection for operational environments.
Open Source Alternative to:
Local-first, Git-native personal knowledge base with AI
Stars
20,116Last commit
13 hours agoLicense
AGPL-3.0
A free, open source note-taking app built on plain Markdown files, Git version control, and direct AI model integration. No account required.
Open Source Alternative to:
Cross-platform, secure password manager
Stars
29,324Last commit
9 hours agoLicense
GPL-3.0
KeePassXC is an open-source password manager that securely stores and manages sensitive information across Windows, macOS, and Linux.
Open Source Alternative to:
24/7 screen and audio recorder with AI memory search
Stars
21,998Last commit
10 hours agoLicense
Other
Records your screen and microphone locally, transcribes meetings automatically, and exposes selected work context to compatible AI assistants through its MCP server and local API.
Open Source Alternative to:
Take control of your identity with a secure, flexible solution
Stars
26,017Last commit
7 hours agoLicense
MIT
authentik is an open-source identity provider that offers self-hosted authentication, authorization, and user management for businesses of all sizes.
Open Source Alternative to:
AI workforce platform where agents, skills, and memory live in your repo
Stars
20,288Last commit
6 hours agoLicense
Elastic-2.0
Manages a team of AI agents across your company, with every agent, skill, memory, and connector stored as versioned files in a git repo you own and self-host.
Open Source Alternative to:
Zero trust network access that's better than VPN
Stars
23,125Last commit
12 hours agoLicense
AGPL-3.0
Deploy zero trust access to infrastructure, self-hosted apps, and SaaS tools in days. Identity-aware security with seamless user experience.
Open Source Alternative to:
Self-hosted wiki with AI, compliance, and real-time editing
Stars
22,039Last commit
19 hours agoLicense
AGPL-3.0
Self-hosted wiki platform for enterprise teams with real-time collaboration, built-in AI, SSO, RBAC permissions, and compliance support for ITAR, FedRAMP, and GDPR.
Open Source Alternative to:
Open-source data integration for modern teams
Stars
22,247Last commit
6 hours agoLicense
Elastic-2.0
Seamlessly sync data from any source to any destination with a flexible, extensible platform that grows with your data needs.
Open Source Alternative to:
Create 2D and 3D games without coding, powered by AI assistance
Stars
Stars growing over the last 30 days27,748Last commit
20 hours agoLicense
Unknown
Free, open-source game engine with visual event system, AI tutor, and one-click publishing to Steam, iOS, Android, and web platforms.
Open Source Alternative to:
Agentic AI framework that runs, learns, and self-corrects
Stars
19,523Last commit
6 days agoLicense
MIT
Autonomous AI agent framework that operates on its own sandboxed computer, creates tools dynamically, manages memory, and executes multi-step workflows with full transparency.
Open Source Alternative to:
Flexible database meets intuitive spreadsheet interface
Stars
21,906Last commit
6 hours agoLicense
AGPL-3.0
Open-source platform combining powerful database capabilities with a user-friendly spreadsheet interface for efficient data management and collaboration.
Open Source Alternative to:
Watch YouTube without Google tracking you or showing ads
Stars
Stars growing over the last 30 days25,557Last commit
1 day agoLicense
AGPL-3.0
Open source front-end for YouTube that strips out ads, tracking, and algorithmic distractions while letting you subscribe to channels and manage playlists.
Open Source Alternative to:
AI agents that autonomously fix code and resolve GitHub issues
Stars
20,600Last commit
15 hours agoLicense
MIT
State-of-the-art AI agent that uses language models like GPT-4o to autonomously solve GitHub issues, fix bugs, and implement features with configurable YAML setup.
Open Source Alternative to:
AI-powered DevSecOps for faster, secure software delivery
Stars
24,552Last commit
6 hours agoLicense
MIT
A comprehensive AI-powered DevSecOps platform that integrates development, security, and operations, streamlining software delivery and enhancing productivity.
Open Source Alternative to:
Self-hosted CRM for enhanced business relationships
Stars
24,029Last commit
4 days agoLicense
MIT
Open source customer relationship management platform with sales tracking, marketing automation, and customizable workflows for businesses of all sizes.
Open Source Alternative to:
Petabyte-scale observability, without the massive bill.
Stars
22,438Last commit
6 hours agoLicense
AGPL-3.0
Monitor logs, metrics, and traces with an open-source observability platform. Achieve petabyte scale with 140x lower storage costs and high performance.
Open Source Alternative to:
Self-hosted newsletter and mailing list manager
Stars
23,871Last commit
8 hours agoLicense
AGPL-3.0
Send email campaigns and transactional messages to millions of subscribers with a single high-performance binary backed by Postgres.
Open Source Alternative to:
Revolutionize your Git workflow with simultaneous branches
Stars
21,829Last commit
6 hours agoLicense
FSL-1.1-MIT
GitButler is a powerful Git client that enables seamless work on multiple branches concurrently, enhancing your existing workflow.
Open Source Alternative to:
Python-native workflow orchestration for data and ML teams
Stars
24,043Last commit
17 hours agoLicense
Apache-2.0
Orchestrate data pipelines, ML jobs, and agent workflows in plain Python with automatic retries, scheduling, and a unified UI for every run across your infrastructure.
Open Source Alternative to:
Infrastructure as code in your favorite language
Stars
25,795Last commit
6 hours agoLicense
Apache-2.0
Pulumi enables developers to define and manage cloud infrastructure using familiar programming languages instead of domain-specific languages.
Open Source Alternative to:
Cross-platform terminal with AI built in
Stars
22,544Last commit
3 days agoLicense
Apache-2.0
Enhance your terminal with AI, file previews, and web browsing. Available on MacOS, Linux, and Windows.
Open Source Alternative to:
Self-hosted personal finance manager with double-entry bookkeeping
Stars
24,946Last commit
1 day agoLicense
AGPL-3.0
Track transactions, budgets, and accounts with a double-entry system, multi-currency support, rule engine, and REST API. Fully self-hostable.
Open Source Alternative to:
Full-featured media center for your TV and beyond
Stars
21,355Last commit
16 hours agoLicense
Unknown
Plays videos, music, TV shows, photos, and games from a single interface, with live TV, PVR recording, and broad format support across devices.
Open Source Alternative to:
Fast, private browser that puts you first
Stars
23,930Last commit
10 hours agoLicense
MPL-2.0
A secure web browser that blocks ads and trackers, protects privacy, and loads pages faster while saving data and battery life.
Open Source Alternative to:
Collect, transform, and route logs and metrics in one tool
Stars
22,730Last commit
15 hours agoLicense
MPL-2.0
Rust-built observability pipeline tool that collects, transforms, and routes logs and metrics across 47 sources and 62 sinks with no runtime dependencies.
Open Source Alternative to:
Self-hosted music streaming for your personal collection
Stars
24,251Last commit
20 hours agoLicense
GPL-3.0
Open source music server that streams your personal library via a web player or any Subsonic-compatible mobile app on iOS and Android.
Open Source Alternative to:
Task manager with time tracking, focus mode, and deep work tools
Stars
Stars growing over the last 30 days22,996Last commit
7 hours agoLicense
MIT
Privacy-first task manager combining task lists, Kanban, Pomodoro timers, time tracking, and integrations with GitHub, GitLab, and Jira. No account required, works offline.
Open Source Alternative to:
Fast, secure, offline API client with Git integration
Stars
19,338Last commit
1 day agoLicense
MIT
A modern API client offering local-only data storage, Git integration, plugin extensibility, and multi-protocol support for developers.
Open Source Alternative to:
Run dozens of AI coding agents in parallel on your machine
Stars
Stars growing over the last 30 days15,387Last commit
6 hours agoLicense
Elastic-2.0
macOS app that orchestrates multiple AI coding agents simultaneously, each in its own isolated Git worktree, so you can work on many tasks at once.
Open Source Alternative to:
No-code web scraping, crawling, and extraction platform
Stars
17,932Last commit
23 hours agoLicense
AGPL-3.0
Turn any website into structured data using a visual recorder, natural language prompts, or API. Includes proxy rotation, scheduling, and webhook integrations.
Open Source Alternative to:
Social media reimagined for community and connection
Stars
18,349Last commit
9 hours agoLicense
MIT
A decentralized social network focused on fostering meaningful interactions and giving users control over their data and experience.
Open Source Alternative to:
Collaborative bookmark manager for teams and individuals
Stars
20,156Last commit
1 day agoLicense
AGPL-3.0
Open-source platform to collect, organize, and preserve webpages with powerful collaboration features
Open Source Alternative to:
Unify data models and metrics across your entire stack
Stars
21,044Last commit
6 hours agoLicense
Unknown
Cube is a universal semantic layer that connects data sources to analytics tools, providing consistent definitions and fast queries.
Open Source Alternative to:
Desktop multi-agent workforce for automating real tasks
Stars
15,618Last commit
1 day agoLicense
Apache-2.0
Self-hostable desktop app that runs a coordinated team of AI agents to browse the web, manage files, execute terminal commands, and complete complex workflows.
Open Source Alternative to:
Visual project management with complete data control
Stars
21,129Last commit
13 hours agoLicense
MIT
Open-source Kanban board solution offering visual task management, self-hosting capabilities, and robust security features for teams and individuals.
Open Source Alternative to:
Free, private screen recording for Chrome
Stars
18,794Last commit
15 days agoLicense
GPL-3.0
Capture, annotate, and edit screen recordings with no limits or sign-up required. Completely private and open source.
Open Source Alternative to:
Empower your digital strategy with actionable insights
Stars
21,963Last commit
7 hours agoLicense
GPL-3.0
Comprehensive web analytics platform offering full data ownership, privacy protection, and customizable insights for data-driven decision making.
Open Source Alternative to:
Build AI agents and RPA workflows without writing code
Stars
21,667Last commit
8 months agoLicense
Unknown
No-code platform for building AI agents and RPA workflows that automate repetitive business tasks across finance, HR, sales, and operations.
Open Source Alternative to:
Privacy-first knowledge base with any AI model you choose
Stars
16,534Last commit
18 hours agoLicense
Apache-2.0
Self-hostable NotebookLM alternative that lets teams build searchable knowledge bases from diverse sources, with support for any LLM and no data limits.
Open Source Alternative to:
Secure, open-source document signing for everyone
Stars
15,483Last commit
8 hours agoLicense
AGPL-3.0
Streamline your document workflows with a powerful, privacy-focused e-signature platform that puts you in control of your data.
Open Source Alternative to:
Fast grammar checking that respects your privacy
Stars
Stars growing over the last 30 days16,831Last commit
6 hours agoLicense
Apache-2.0
Open source grammar checker that analyzes your writing quickly while keeping your data completely private and secure on your device.
Open Source Alternative to:
c15t – Open-source cookie banner, built for control and lightening fast modern web apps.
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InfluxDB
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