Completely free open source software

Browse free and open source software that is completely free to use. Every tool listed here offers a free plan or is free of charge — no cost barriers to get started.

Marvel

The collaborative design platform. Wireframe, prototype, user test, design and inspect designs in one place, for free! Or create an integration with our API.

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Better Stack

Better Stack lets you see inside any stack, debug any issue, and resolve any incident.

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Stack Auth

Stack Auth is the open-source Auth0 alternative. We build your sign in page so you don't have to. AuthN, authZ, and user management in just 5 minutes.

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Beaudar

The name "Beaudar" is derived from the pronunciation of the word "expression" in Cantonese, and it is the Chinese version of "Utterances". For more information, please visit this blog. Open Source. 📖 No tracking, no ads, always free forever. ♻️ No data retention, all data is saved in the user's GitHub issue. 📚 Multiple themes derived from GitHub primer. 🌈 Lightweight, no font download, no JS framework loading. 🍜 What's the difference between Beaudar and Utterances? Chinese interface, closer distance to increase comment friendliness. Avatar modification, small avatar displayed on mobile is more exquisite. Identity identification, never breaks lines in any case. Comment time, reduced to the same size as the identity identification. Name display, the name of the commenter is enlarged for better recognition. Link opening, opens in a new tab in line with habits. Error information, presented in a friendly dialog box form. Comment avatar, can be selected using the Tab key. Loading status, default loading status can be configured to be removed. Remove source, click the loading icon to jump to the homepage. Refresh page, errors and exceptions will allow for refreshing. Maintain theme, the theme will remain after refreshing the page. Branch options, add repository branch items for verification. Comment order, can be selected to be in ascending or descending order by time. Comment position, can set the position of the comment input box.

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Intermittent Fasting Calculator

The Intermittent Fasting Calculator is a free, no-registration online tool that helps you plan the next meal and fasting window. Choose from popular methods like 16:8, 14:10, or create custom fasting hours. Simply input your preferred eating time and get instant results with a visual 24-hour timeline. Export your schedule as text or image for easy sharing and reference. Perfect for beginners and experienced fasters alike, with a modern interface that works seamlessly on all devices

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CopilotKit

CopilotKit is a free, open-source alternative to CommandBar . CopilotKit Docs · Examples · Enterprise Intelligence Platform · Discord Build agent-native applications — on any framework, on any surface. Generative UI, shared state, and human-in-the-loop workflows for React, Angular, Vue, React Native — and in Slack and Microsoft Teams. What is CopilotKit CopilotKit is a best-in-class SDK for building full-stack agentic applications, Generative UI, and chat applications. What started as a React library is now the horizontal layer between your agents and your users : the same agent can power your web app, your mobile app, and your team's Slack or Microsoft Teams workspace. We are the company behind the AG-UI Protocol - adopted by Google, LangChain, AWS, Microsoft, Mastra, PydanticAI, and more! Quick Start Up and running in under five minutes. All you need is an LLM key (OpenAI, Anthropic, Gemini, etc.). npx copilotkit@latest create Agent Skills CopilotKit ships agent skills that teach your coding agent (Claude Code, Codex, Cursor, Gemini, and others) how to set up, build with, integrate, debug, and upgrade CopilotKit. Install them into any project directory: npx copilotkit@latest skills install Run it again any time to refresh to the latest skills. Bring Your App to Life Whole.Generative.UI.v5.mp4 Add AI to your app in 1 minute Features: Chat UI – A fully customizable chat interface that supports message streaming, tool calls, and agent responses. Backend Tool Rendering – Enables agents to call backend tools that return UI components rendered directly in the client. Generative UI – Allows agents to generate and update UI components dynamically at runtime based on user intent and agent state. Shared State – A synchronized state layer that both agents and UI components can read from and write to in real time. Human-in-the-Loop – Lets agents pause execution to request user input, confirmation, or edits before continuing. Self-Learning (early access) – Agents that continuously improve from user feedback via in-context reinforcement learning (CLHF). 🧩 Works With Your Stack One agent backend. Every frontend. Platform Status Get Started ⚛️ React / Next.js ✅ GA Quickstart 🅰️ Angular ✅ Supported Source Code & Quickstart 💚 Vue ✅ Supported Source Code - Quickstart coming soon 📱 React Native ✅ Supported Quickstart 💬 Slack / Microsoft Teams ✅ Supported Channels · Quickstart 🔜 Discord / WhatsApp / Telegram / Google Chat / iMessage / SMS 🟡 Coming soon Channels Your agent logic stays the same — AG-UI handles the wire protocol, CopilotKit handles the UI layer for each framework and channel. 💬 Channels: One Agent, Every Chat App The Channels SDK takes the agent you already built and drops it into the chat apps your users live in — same tools, same shared state, same human-in-the-loop, no rewrite ( Learn more ). Slack – Agents as first-class Slack apps: threads, tool calls, and human-in-the-loop approvals right in the channel. Microsoft Teams – Bring agentic workflows to the enterprise, where your org already lives. 👉 Explore Channels → 🧠 Self-Learning Agents Improve your product by learning over time. With Continuous Learning from Human Feedback (CLHF) , part of the CopilotKit Intelligence Platform , agents improve with every interaction: In-context reinforcement learning – Agents automatically improve from user interactions, no model fine-tuning required. Automatic prompt augmentation – Agent behavior adapts based on recent interactions and outcomes. Per-user adaptation – Agents learn individual preferences and get better for each user over time. Threads & persistence – Full interaction history — generative UI, human-in-the-loop, shared state — captured across sessions. Available via CopilotKit Cloud or self-hosted. 🔒 Early access: We're onboarding teams now. 👉 Request early access → cpk-cli.mp4 What this gives you: CopilotKit installed – Core packages are fully set up in your app Provider configured – Context, state, and hooks ready to use Agent <> UI connected – Agents can stream actions and render UI immediately Deployment-ready – Your app is ready to deploy Complete getting started guide → How it works: CopilotKit connects your UI, agents, and tools into a single interaction loop. This enables: Agents that ask users for input Tools that render UI Stateful workflows across steps and sessions One agent, deployed across web, mobile, and chat platforms ⭐️ useAgent Hook The useAgent hook sits directly on AG-UI, giving you full programmatic control over the agent connection. // Programmatically access and control your agents const { agent } = useAgent ( { agentId : "my_agent" } ) ; // Render and update your agent's state return < div > < h1 > { agent . state . city } < / h1 > < button onClick = { ( ) => agent . setState ( { city : "NYC" } ) } > Set City < / b u t t o n > < / div > Check out the useAgent docs to learn more. CopilotKit.UseAgent.Graphic.Motion_2.mp4 Generative UI Generative UI is a core CopilotKit pattern that allows agents to dynamically render UI as part of their workflow. demo-generative-ui.mp4 Compare the Three Types Explore: Static (AG-UI Protocol) Declarative (A2UI) Open-Ended (MCP Apps & Open JSON) Generative UI educational repo → 🖥️ AG-UI: The Agent–User Interaction Protocol Connect agent workflows to user-facing apps, with deep partnerships and 1st-party integrations across the agentic stack—including LangChain, CrewAI, Mastra, PydanticAI, and more. npx create-ag-ui-app my-agent-app Learn more in the AG-UI README → 🤝 Community What's New Have questions or need help? Join our Discord → Read the Docs → Try the Enterprise Intelligence Platform → Stay up to date with our latest releases! Follow us on LinkedIn → Follow us on X → 🙋🏽‍♂️ Contributing Thanks for your interest in contributing to CopilotKit! 💜 We value all contributions, whether it's through code, documentation, creating demo apps, or just spreading the word. Here are a few useful resources to help you get started: For code contributions, CONTRIBUTING.md . For documentation-related contributions, check out the documentation contributions guide . Want to contribute but not sure how? Join our Discord and we'll help you out! 📄 License This repository's source code is available under the MIT License .

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Cacoo

Create diagrams online with a collaborative online diagramming tool. Join the 390,000 users drawing diagrams, flowcharts, and wireframes online with Cacoo. Diagram from anywhere. Online diagramming tool for collaborating on wireframes, flowcharts, and more

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EmailOctopus

Manage and email your subscribers for far cheaper with EmailOctopus. Drag and drop email builder, powerful analytics, bounce/complaint tracking and more.

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Short.io

Short.io makes short links (vanity urls) on your own domain. Free signup, analytics and API. Chrome, slack, zapier and segment integrations.

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Queens Answer Today

Welcome to your daily LinkedIn Queens answers resource. Find the full grid solution, strategic placement guidance, and tips for improving your Queens skills.

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Jotform

Create forms and surveys for free with Jotform’s drag-and-drop form builder. Start collecting registrations, applications, orders, and payments today.

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Caricature Generator

AI-powered tool that transforms photos into creative, exaggerated caricature portraits instantly with professional customization options.

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twenty

twenty is a free, open-source alternative to Salesforce . The #1 Open-Source CRM Website · Documentation · Roadmap · Discord · Figma Why Twenty Twenty gives technical teams the building blocks for a custom CRM that meets complex business needs and quickly adapts as the business evolves. Twenty is the CRM you build, ship, and version like the rest of your stack. Learn more about why we built Twenty Installation Cloud The fastest way to get started. Sign up at twenty.com and spin up a workspace in under a minute, with no infrastructure to manage and always up to date. Build an app Scaffold a new app with the Twenty CLI: npx create-twenty-app my-app Define objects, fields, and views as code: import { defineObject , FieldType } from 'twenty-sdk/define' ; export default defineObject ( { nameSingular : 'deal' , namePlural : 'deals' , labelSingular : 'Deal' , labelPlural : 'Deals' , fields : [ { name : 'name' , label : 'Name' , type : FieldType . TEXT } , { name : 'amount' , label : 'Amount' , type : FieldType . CURRENCY } , { name : 'closeDate' , label : 'Close Date' , type : FieldType . DATE_TIME } , ] , } ) ; Then ship it to your workspace: npx twenty app:publish --private See the app development guide for objects, views, agents, and logic functions. Self-hosting Run Twenty on your own infrastructure with Docker Compose , or contribute locally via the local setup guide . Everything you need Twenty gives you the building blocks of a modern CRM (objects, views, workflows, and agents) and lets you extend them as code. Here's a tour of what's in the box. Want to go deeper? Read the User Guide for product walkthroughs, or the Documentation for developer reference. Learn more about apps in doc Learn more about version control in doc Learn more about primitives in doc Learn more about layouts in doc Learn more about AI in doc Learn more about CRM features in doc Stack TypeScript Nx NestJS , with BullMQ , PostgreSQL , Redis React , with Jotai , Linaria and Lingui Thanks Thanks to these amazing services that we use and recommend for code review (Greptile), catching bugs (Sentry) and translating (Crowdin). Join the Community Star the repo · Discord · Feature requests · Releases · X · LinkedIn · Crowdin · Contribute

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MarkText

Next generation markdown editor. A simple and elegant open-source markdown editor that focused on speed and usability.

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UXPin

Design tool like no other. Prototypes that feel real, with powers of code components, logic, states, and design systems. Join for free!

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Netlify

Realize the speed, agility and performance of a scalable, composable web architecture with Netlify. Explore the composable web platform now!

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utterances

A lightweight comments widget built on GitHub issues. Use GitHub issues for blog comments, wiki pages and more! Open source . 🙌 No tracking, no ads, always free. 📡🚫 No lock-in. All data stored in GitHub issues. 🔓 Styled with Primer , the css toolkit that powers GitHub. 💅 Dark theme. 🌘 Lightweight. Vanilla TypeScript. No font downloads, JavaScript frameworks or polyfills for evergreen browsers. 🐦🌲 how it works When Utterances loads, the GitHub issue search API is used to find the issue associated with the page based on url , pathname or title . If we cannot find an issue that matches the page, no problem, utterances-bot will automatically create an issue the first time someone comments. To comment, users must authorize the utterances app to post on their behalf using the GitHub OAuth flow . Alternatively, users can comment on the GitHub issue directly.

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Linkedin Pinpoint Answer

Linkedin Pinpoint Answer: Your All-in-One Companion for LinkedIn Brain Games Introduction If you enjoy daily brain challenges on LinkedIn, you may already know games like Pinpoint, Queen, Crossclimb, Tango, Zip, Mini Sudoku, and Patches. These puzzles test logic, pattern recognition, and problem-solving in fun but sometimes difficult ways. That’s where Linkedin Pinpoint Answer comes in. We are an all-in-one companion for solving and mastering LinkedIn puzzle games. Whether you're stuck, trying to keep your streak, or want to understand the logic behind answers, our platform provides instant solutions, clear explanations, and useful strategies across multiple games in one place. Main Features 1. Instant Answers Get fast and accurate solutions for Pinpoint, Queen, Crossclimb, Tango, Zip, Mini Sudoku, and Patches as soon as new puzzles are released. 2. Streak Protection Avoid losing progress. Timely updates help you maintain daily streaks across all LinkedIn puzzle games. 3. Daily Updates Always synced with LinkedIn’s puzzle schedule, offering the latest answers and breakdowns as soon as they go live. 4. Clear Explanations We don’t just give answers—we explain them. Learn solving logic and improve your puzzle skills over time. 5. Multi-Game Hub Play and learn multiple LinkedIn games in one place, from word puzzles to logic and number challenges. 6. Strategy Insights Discover patterns, traps, and solving methods to improve your long-term performance across all games. Conclusion LinkedIn puzzle games are becoming more diverse and challenging, from Pinpoint to Mini Sudoku and beyond. Linkedin Pinpoint Answer supports the full experience—providing answers when needed, explanations when useful, and strategies to help you improve. Whether you're stuck or want to stay ahead, this is your all-in-one hub for LinkedIn puzzle games.

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Pixso

Pixso is an all-in-one design collaboration tool that helps production and research teams create prototypes, ui/ux design, visual design, and low-code delivery for a more streamlined work experience, making team collaboration more efficient. sketch and figma formats are supported.

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Omlet

Omlet · Measure the Success of Your Components. Component analytics and insights for React.

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AI Agent Development

AI Agent Development is a platform for building, testing, and deploying autonomous AI agents.

AI Agent Builder

AI Agent Builder is a platform for creating, deploying, and managing AI agents.

AdGuard

AdGuard is a cross-platform ad blocker that filters web content and protects privacy.

Ad Blocker

Ad Blocker is a browser tool that removes intrusive ads and pop-ups from web pages.

Acorn 7

Acorn 7 is a Mac image editor for editing photos and creating graphics.

Adobe Premiere Pro

Adobe Premiere Pro is a professional video editing software for film, TV, and web.