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Open Source Projects using CSS

A curated collection of the 603 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.

Favicon of Justnote

Justnote

Privacy-focused note-taking made simple and fast

  • Stars

    67

  • Last commit

    7 months ago

  • License

    GPL-2.0
Justnote is a secure note-taking app that lets you easily create and sync notes across devices while maintaining full control of your data.

Open Source Alternative to:

Favicon of Notion
Notion
Favicon of Palform

Palform

Secure, encrypted forms with advanced features

  • Stars

    45

  • Last commit

    1 month ago

  • License

    AGPL-3.0
Build end-to-end encrypted forms with enterprise-grade features, no coding required. Protect sensitive data and enhance user trust.

Open Source Alternative to:

Favicon of Google Forms
Google Forms
Favicon of Reflet

Reflet

Turn user feedback into features that matter

  • Stars

    34

  • Last commit

    10 days ago

  • License

    SSPL-1.0
Collect feedback, prioritize with AI-powered voting, and share transparent roadmaps. Build products users love with automated triage and seamless integration.

Open Source Alternative to:

Favicon of Featurebase
Featurebase
Favicon of itsnotes

itsnotes

Self-hosted sticky notes with better organization

  • Stars

    31

  • Last commit

    6 days ago

  • License

    MIT
A self-hosted, open-source note-taking app that keeps the Google Keep sticky-note feel while adding folders, timelines, list views, and import support.

Open Source Alternative to:

Favicon of Google Keep
Google Keep
Favicon of Hyvor Post

Hyvor Post

Privacy-first newsletter platform without tracking

  • Stars

    32

  • Last commit

    3 days ago

  • License

    AGPL-3.0
Create and send newsletters with complete privacy protection. No tracking, no data collection - just simple, clean email delivery with customizable templates and archive sites.

Open Source Alternative to:

Favicon of Resend
Resend
Favicon of Sayr

Sayr

Bridge internal workflows with public collaboration

  • Stars

    22

  • Last commit

    1 day ago

  • License

    Unknown
Source-available project management platform with dual views - internal team workspace and public portal for user feedback, voting, and progress tracking.

Open Source Alternative to:

Favicon of Linear
Linear
Favicon of Mimrai

Mimrai

AI-powered task management with radical focus

  • Stars

    26

  • Last commit

    6 months ago

  • License

    AGPL-3.0
Open source minimalist task management tool with AI companion that filters noise, automates coordination, and guides teams through complexity with calm focus.

Open Source Alternative to:

Favicon of Linear
Linear
Favicon of StatusScout

StatusScout

Complete website health monitoring and security scanning

  • Stars

    15

  • Last commit

    4 months ago

  • License

    Unknown
Monitor website uptime, detect security vulnerabilities, find broken links, and simulate user flows. Get instant alerts when issues arise. Free tier available.

Open Source Alternative to:

Favicon of BetterStack
BetterStack
Favicon of Spanlens

Spanlens

AI
LLM observability: cost, latency, and traces in one place

  • Stars

    13

  • Last commit

    3 days ago

  • License

    MIT
Drop-in observability platform for OpenAI, Anthropic, and Gemini that logs every request, tracks costs, traces agent workflows, and flags anomalies and PII.

Open Source Alternative to:

Favicon of LangSmith
LangSmith
Favicon of Suprascribe

Suprascribe

Automatically discover hidden subscriptions from your inbox

  • Stars

    11

  • Last commit

    1 day ago

  • License

    AGPL-3.0
Free subscription tracker that automatically scans your email to find recurring charges. Privacy-focused discovery with complete spending overview and management tools.

Open Source Alternative to:

Favicon of Rocket Money
Rocket Money
Favicon of Tiledesk

Tiledesk

AI
No-code platform to build AI agents and automate support

  • Stars

    14

  • Last commit

    2 days ago

  • License

    MIT
Build AI chatbots, automate customer support workflows, and connect live agents across web, WhatsApp, email, and voice with a no-code visual designer.

Open Source Alternative to:

Favicon of Zendesk
Zendesk
Favicon of Corpus

Corpus

Ask once, get answers across every document

  • Stars

    13

  • Last commit

    3 months ago

  • License

    AGPL-3.0
Upload files, ask questions, and get AI‑backed answers with citations. Compare, synthesize, and export results for teams and polished outputs.

Open Source Alternative to:

Favicon of Hebbia
Hebbia
Favicon of Hyvor Blogs

Hyvor Blogs

Blogging platform with built-in SEO, themes, and APIs

  • Stars

    15

  • Last commit

    15 hours ago

  • License

    AGPL-3.0
Self-hostable blogging platform with a clean editor, zero-config SEO, custom themes, real-time collaboration, and built-in comments and newsletters.

Open Source Alternative to:

Favicon of WordPress
WordPress
Favicon of Proxed AI

Proxed AI

AI
Secure AI API management for iOS apps with DeviceCheck

  • Stars

    8

  • Last commit

    8 months ago

  • License

    AGPL-3.0
A secure proxy service that protects AI API keys using Apple DeviceCheck, enabling safe integration of ChatGPT, Claude, and other AI models in iOS apps
Favicon of Reqcore

Reqcore

AI
Own your hiring data with unlimited seats forever

  • Stars

    0

  • Last commit

    21 days ago

  • License

    AGPL-3.0
Self-hosted open-source ATS with no per-seat pricing. Full data ownership, modern tech stack, and complete control over your recruitment process.

Open Source Alternative to:

Favicon of Lever
Lever
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