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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.

Favicon of LyteNyte Grid

LyteNyte Grid

Lightning-fast React data grid for enterprise scale

  • Stars

    1,022

  • Last commit

    6 days ago

  • License

    Unknown
High-performance React data table with server-side loading, tree data, pivoting, and advanced features. Handles billions of rows with minimal bundle size.
Favicon of CourseLit

CourseLit

Create, sell, and manage online courses with ease

  • Stars

    1,256

  • Last commit

    29 days ago

  • License

    AGPL-3.0
An open-source platform for building and selling online courses, featuring customizable themes, integrated payments, and user management.

Open Source Alternative to:

Favicon of Udemy
Udemy
Favicon of LogChimp

LogChimp

Open-source feedback management for product teams

  • Stars

    1,119

  • Last commit

    10 hours ago

  • License

    Apache-2.0
Collect, organize, and prioritize user feedback to build better products. Self-hosted solution for seamless feature request management.

Open Source Alternative to:

Favicon of Featurebase
Featurebase
Favicon of Sessy

Sessy

Own your SES email analytics, from send to inbox

  • Stars

    913

  • Last commit

    2 days ago

  • License

    Unknown
Track SES deliveries, bounces, opens and clicks in a self-hosted dashboard with real-time search, analytics and reputation monitoring.

Open Source Alternative to:

Favicon of Resend
Resend
Favicon of Flow

Flow

Fast, secure browsing with powerful organization features

  • Stars

    1,066

  • Last commit

    3 months ago

  • License

    GPL-3.0
A modern browser combining minimalist design with smart features like profiles, spaces, and command palette. Full Chrome extension support and privacy-focused browsing.

Open Source Alternative to:

Favicon of Firefox
Firefox
Favicon of Cozy

Cozy

Your secure French personal cloud for complete data control

  • Stars

    1,272

  • Last commit

    21 days ago

  • License

    AGPL-3.0
Open-source personal cloud that automatically gathers all your data from third-party services. French-hosted with privacy-first design, no ads, and seamless device sync.

Open Source Alternative to:

Favicon of LastPass
LastPass
Favicon of Swetrix

Swetrix

Cookieless, privacy-first web analytics without the complexity

  • Stars

    1,165

  • Last commit

    3 days ago

  • License

    AGPL-3.0
Privacy-first web analytics with real-time dashboards, session replays, error tracking, A/B testing, and GDPR compliance out of the box. No cookies, no consent banners.

Open Source Alternative to:

Favicon of Google Analytics
Google Analytics
Favicon of ProcessWire

ProcessWire

Flexible CMS for developers, powerful for clients

  • Stars

    1,145

  • Last commit

    6 days ago

  • License

    Unknown
A versatile, open-source content management system with a powerful API, modular architecture, and intuitive interface for seamless web development.

Open Source Alternative to:

Favicon of WordPress
WordPress
Favicon of ByteChef

ByteChef

AI
Build AI agents and automate complex workflows seamlessly

  • Stars

    992

  • Last commit

    14 hours ago

  • License

    Apache-2.0
Create intelligent automation workflows combining AI agents with your favorite apps and services. Connect, automate, and scale your operations without complex coding.

Open Source Alternative to:

Favicon of n8n
n8n
Favicon of TimeScribe

TimeScribe

Transform your time tracking into actionable insights

  • Stars

    885

  • Last commit

    3 months ago

  • License

    GPL-3.0
Advanced time tracking and productivity analytics tool that captures detailed work patterns, generates comprehensive reports, and helps optimize workflow efficiency.

Open Source Alternative to:

Favicon of Clockify
Clockify
Favicon of Taiga

Taiga

Agile project management for cross-functional teams

  • Stars

    847

  • Last commit

    17 days ago

  • License

    MPL-2.0
Self-hostable agile project management tool with Kanban and Scrum boards, sprint planning, issue tracking, and reporting for teams of any size.

Open Source Alternative to:

Favicon of Monday
Monday
Favicon of Hyvor Relay

Hyvor Relay

Open-source email API with enterprise deliverability

  • Stars

    862

  • Last commit

    16 hours ago

  • License

    AGPL-3.0
Self-hosted email API alternative to AWS SES & Mailgun. Open-source AGPL-3.0 with enterprise features, automated deliverability, and cloud version coming 2026.

Open Source Alternative to:

Favicon of Resend
Resend
Favicon of Keyshade

Keyshade

Secure secret management with public key encryption

  • Stars

    765

  • Last commit

    4 months ago

  • License

    MPL-2.0
Secure secret management platform with public key encryption, automated rotation, versioning, and real-time collaboration tools for development teams.

Open Source Alternative to:

Favicon of Keeper
Keeper
Favicon of Pluton

Pluton

Self-hosted encrypted backups with 70+ cloud storage options

  • Stars

    743

  • Last commit

    11 days ago

  • License

    Apache-2.0
Free, open-source backup solution with end-to-end encryption. Self-hosted control, supports 70+ cloud providers, automated incremental backups, and zero vendor lock-in.

Open Source Alternative to:

Favicon of Veeam
Veeam
Favicon of Phase

Phase

Secure, deploy, and manage application secrets effortlessly

  • Stars

    905

  • Last commit

    12 hours ago

  • License

    MIT
Open source platform for engineering teams to manage secrets and environment variables from development to production, with powerful integrations.

Open Source Alternative to:

Favicon of LastPass
LastPass
Favicon of DoubleZero

DoubleZero

Self-hosted email infrastructure for developers

  • Stars

    1,248

  • Last commit

    2 years ago

  • License

    AGPL-3.0
00 is an open-source email API and infrastructure solution that allows developers to own and control their email stack.

Open Source Alternative to:

Favicon of Resend
Resend
Favicon of Linguist

Linguist

Privacy-focused translation with offline capabilities

  • Stars

    1,052

  • Last commit

    13 days ago

  • License

    BSD-3-Clause
Full-featured browser extension for translating web pages, text, and subtitles with offline mode, personal dictionary, and custom translator support.

Open Source Alternative to:

Favicon of Google Translate
Google Translate
Favicon of Linky

Linky

A delightfully rich and dynamic link-in-bio.

  • Stars

    796

  • Last commit

    17 days ago

  • License

    MIT
Build a dynamic link-in-bio page with a drag-and-drop editor. Integrate platforms to showcase live content and connect with your audience.

Open Source Alternative to:

Favicon of LinkTree
LinkTree
Favicon of Bacalhau

Bacalhau

Revolutionizing data processing with Compute Over Data

  • Stars

    869

  • Last commit

    1 day ago

  • License

    Apache-2.0
Bacalhau is an open-source platform for fast, cost-effective, and secure distributed computing, seamlessly integrating with Docker and WebAssembly workflows.
Favicon of LostPixel

LostPixel

Visual regression testing made effortless

  • Stars

    1,682

  • Last commit

    4 months ago

  • License

    MIT
Automated visual testing tool that detects UI changes, ensures consistency, and accelerates development workflows.

Open Source Alternative to:

Favicon of Chromatic
Chromatic
Favicon of VoiceTypr

VoiceTypr

AI
Offline voice dictation that types into any app

  • Stars

    678

  • Last commit

    11 hours ago

  • License

    AGPL-3.0
Dictate into any app on Mac or Windows using on-device AI models. One-time purchase, 99+ languages, no subscription required.

Open Source Alternative to:

Favicon of Wispr Flow
Wispr Flow
Favicon of Temps

Temps

One self-hosted binary replaces Vercel, Sentry, and analytics tools

  • Stars

    654

  • Last commit

    11 hours ago

  • License

    Apache-2.0
Self-hosted platform for small dev teams combining deployments, error tracking, analytics, session replay, uptime monitoring, and managed databases in one dashboard.

Open Source Alternative to:

Favicon of Vercel
Vercel
Favicon of OpenPanel

OpenPanel

Simplify server management with an intuitive interface

  • Stars

    732

  • Last commit

    1 day ago

  • License

    MIT
A user-friendly, open-source control panel for effortless server administration, designed for both beginners and experts.

Open Source Alternative to:

Favicon of Plesk
Plesk
Favicon of Cossistant

Cossistant

AI
AI-native support infrastructure for modern SaaS

  • Stars

    714

  • Last commit

    16 days ago

  • License

    AGPL-3.0
Open-source support platform combining AI and human agents. React components with shadcn/ui design philosophy, styled with Tailwind CSS for NextJS apps.

Open Source Alternative to:

Favicon of Zendesk
Zendesk
Favicon of Kanba

Kanba

Beautiful Kanban boards with seamless payment integration

  • Stars

    645

  • Last commit

    13 days ago

  • License

    MIT
Organize projects with intuitive Kanban boards, powered by Supabase backend and Stripe payment processing for complete project management workflow.

Open Source Alternative to:

Favicon of Monday
Monday
Favicon of TryPost

TryPost

Schedule posts to every major social network, self-hosted

  • Stars

    532

  • Last commit

    10 hours ago

  • License

    AGPL-3.0
Plan, schedule, and auto-publish social media content across 10+ networks with a visual calendar, AI captions, team approvals, and self-hosting support.

Open Source Alternative to:

Favicon of Buffer
Buffer
Favicon of Frontman

Frontman

AI
AI coding agent that sees your live app and edits code

  • Stars

    666

  • Last commit

    11 hours ago

  • License

    Apache-2.0
Open-source AI coding agent that runs in your browser, sees your live DOM and app state, and makes real code edits from plain English descriptions.

Open Source Alternative to:

Favicon of Lovable
Lovable
Favicon of Jarvis

Jarvis

AI
Dictate faster and control your Mac with voice

  • Stars

    616

  • Last commit

    3 months ago

  • License

    MIT
Free, open-source macOS voice assistant that transcribes speech, applies AI transformations, and controls apps hands-free. No subscription, no training required.

Open Source Alternative to:

Favicon of Wispr Flow
Wispr Flow
Favicon of Featurevisor

Featurevisor

Feature management with GitOps for developers

  • Stars

    804

  • Last commit

    10 days ago

  • License

    MIT
Featurevisor is an open-source tool for managing feature flags, experiments, and remote configuration directly from your Git repository.

Open Source Alternative to:

Favicon of LaunchDarkly
LaunchDarkly
Favicon of Snapify

Snapify

Self-hosted screen recording for seamless collaboration

  • Stars

    1,017

  • Last commit

    2 years ago

  • License

    AGPL-3.0
Effortlessly create, share, and collaborate with screen recordings. Control your data with self-hosting or our secure cloud option.

Open Source Alternative to:

Favicon of Screen Studio
Screen Studio
Favicon of Structr

Structr

Build complete web apps with integrated graph database

  • Stars

    828

  • Last commit

    11 days ago

  • License

    Unknown
Open-source low-code platform combining Neo4j graph database, visual schema editor, automatic REST APIs, and page rendering in one self-hosted environment.
Favicon of Contentport

Contentport

Your content engine for growing on Twitter at scale

  • Stars

    763

  • Last commit

    8 months ago

  • License

    AGPL-3.0
Create, schedule & manage Twitter content at scale with AI assistance, beautiful visuals, and multi-account support. Perfect for busy founders.

Open Source Alternative to:

Favicon of Post Bridge
Post Bridge
Favicon of Giselle

Giselle

AI
Build and deploy AI agents through visual workflows

  • Stars

    554

  • Last commit

    18 days ago

  • License

    Apache-2.0
Create powerful AI agents using an intuitive node-based interface that connects multiple LLMs and data sources for automated documentation and development workflows.
Favicon of Monetr

Monetr

Take control of your finances, paycheck by paycheck

  • Stars

    679

  • Last commit

    14 hours ago

  • License

    FSL-1.1-MIT
Manage your money confidently with monetr, putting aside what you need and spending what you want

Open Source Alternative to:

Favicon of YNAB
YNAB
Favicon of Ycode

Ycode

Visual website builder and CMS you can self-host

  • Stars

    277

  • Last commit

    20 hours ago

  • License

    MIT
Build, manage, and host custom websites with a visual drag-and-drop builder and CMS. Self-host free or use managed cloud hosting.

Open Source Alternative to:

Favicon of Framer
Framer
Favicon of OpenComputer

OpenComputer

AI
Persistent cloud VMs that hibernate and wake in seconds

  • Stars

    471

  • Last commit

    10 hours ago

  • License

    Apache-2.0
Provides always-on virtual machines for AI agents with full OS access, persistent state, elastic CPU/memory resizing, and instant checkpoints.

Open Source Alternative to:

Favicon of Modal
Modal
Favicon of Alarik

Alarik

S3-compatible object storage built with Swift

  • Stars

    515

  • Last commit

    2 days ago

  • License

    Apache-2.0
Self-hostable, Apache 2.0-licensed object storage with S3 compatibility, a built-in web console, and horizontal scaling from single node to sharded cluster.

Open Source Alternative to:

Favicon of Amazon S3
Amazon S3
Favicon of Twake Mail

Twake Mail

Secure open source email with advanced encryption & AI

  • Stars

    645

  • Last commit

    18 hours ago

  • License

    AGPL-3.0
Open source professional email solution with PGP encryption, JMAP protocol, AI-powered responses, and advanced antispam protection. Control your data privately.

Open Source Alternative to:

Favicon of Gmail
Gmail
Favicon of Operately

Operately

Open source company management for high-performance startups

  • Stars

    543

  • Last commit

    11 hours ago

  • License

    Apache-2.0
Operately is an open source platform that centralizes projects, goals, and processes, helping startups run efficiently without a COO.

Open Source Alternative to:

Favicon of Linear
Linear
Favicon of Ever Teams

Ever Teams

Real-time work and project management platform

  • Stars

    544

  • Last commit

    2 days ago

  • License

    AGPL-3.0
Ever Teams offers an all-in-one solution for work management, time tracking, and team collaboration with integrations for popular tools.

Open Source Alternative to:

Favicon of Linear
Linear
Favicon of Browser Operator

Browser Operator

AI
Open-source AI browser for intelligent web automation

  • Stars

    500

  • Last commit

    5 months ago

  • License

    BSD-3-Clause
Privacy-focused AI browser with intelligent agents for research, analysis, and workflow automation. Features unified memory, compliance guardrails, and seamless integrations.

Open Source Alternative to:

Favicon of Comet Browser
Comet Browser
Favicon of Typemill

Typemill

Open-source CMS for text-driven websites

  • Stars

    612

  • Last commit

    4 days ago

  • License

    MIT
Create manuals, documentation, and websites with this markdown-based content management system, with options for ebook conversion.

Open Source Alternative to:

Favicon of Confluence
Confluence
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