Open Source Web Development Tools: A 2026 List
The open source web development tools most teams rely on in 2026 are VS Code or VSCodium for editing, Vite for builds, ESLint, Prettier or Biome for code quality, Vitest and Playwright for testing, Tailwind CSS or Bootstrap for styling, Bruno or Hoppscotch for API testing, Supabase or PocketBase for a backend, and Umami or Plausible for analytics. All of them are free to use, the code is public on GitHub, and most use permissive licenses (MIT or Apache-2.0) that let you use them in commercial work. Below is the list by job, with each tool's license as of October 2026, a minimal setup, and the license details that actually matter.
This post covers the tooling around your code. For the frameworks themselves (React, Django, Rails and so on), see open source frameworks compared.
The list at a glance
Licenses are the ones shown in each project's GitHub repository as of October 2026.
| Job | Tool | License | Notes |
|---|---|---|---|
| Code editor | VS Code (Code - OSS) | MIT (source) | Microsoft's downloadable build ships under a separate Microsoft license |
| Code editor | VSCodium | MIT | VS Code built from source without Microsoft telemetry and branding |
| Code editor | Zed | GPL-3.0 (editor) | Fast native editor; some components are Apache-2.0 or AGPL |
| Build tool / dev server | Vite | MIT | Default for React, Vue, Svelte and most new projects |
| Linting | ESLint | MIT | The standard JavaScript/TypeScript linter |
| Formatting | Prettier | MIT | Opinionated formatter |
| Lint + format in one | Biome | MIT or Apache-2.0 | One fast binary that replaces ESLint and Prettier for many projects |
| Unit tests | Vitest | MIT | Jest-compatible API, uses your Vite config |
| End-to-end tests | Playwright | Apache-2.0 | Chromium, Firefox and WebKit from one API |
| Performance audits | Lighthouse | Apache-2.0 | Also built into Chrome DevTools |
| CSS | Tailwind CSS | MIT | Utility classes |
| CSS | Bootstrap | MIT | Ready-made components |
| API client | Bruno | MIT | Stores requests as plain files in your Git repo |
| API client | Hoppscotch | MIT | Runs in the browser; self-hostable |
| Backend | Supabase | Apache-2.0 | Postgres, auth, storage, REST API; hosted or self-hosted |
| Backend | PocketBase | MIT | One Go binary with SQLite, auth and an admin UI |
| Analytics | Umami | MIT | Cookie-free, self-hostable |
| Analytics | Plausible | AGPL-3.0 | Self-hosted Community Edition, or paid cloud |
| Deployment | Coolify | Apache-2.0 | Self-hosted Heroku/Netlify-style PaaS on your own server |
| Diagrams | Excalidraw | MIT | Hand-drawn style whiteboard |
| Design | Penpot | MPL-2.0 | Browser-based design and prototyping |
Editors: VS Code, VSCodium and Zed
The VS Code source repository is MIT licensed, but the build you download from Microsoft is a product distributed under Microsoft's own license and includes telemetry. If you want the editor with a fully open source build, use VSCodium. One practical difference: VSCodium uses the Open VSX extension registry, because Microsoft's Marketplace terms restrict its use to Microsoft products. Most popular extensions are on Open VSX, but a few Microsoft extensions (for example the C# Dev Kit and Remote Development pack) are not.
Zed is a native editor written in Rust with built-in collaboration and AI features. Its editor code is GPL-3.0, which does not affect the code you write in it.
Build, lint and format
A modern frontend project usually starts with Vite:
npm create vite@latest my-app -- --template react-ts
cd my-app
npm install
npm run dev
For code quality, pick one of two setups:
- ESLint + Prettier: the most widely supported combination, with the largest plugin ecosystem (React hooks rules, accessibility rules, framework plugins).
- Biome: a single tool that lints and formats, much faster on large repositories. Start it with:
npm install --save-dev --save-exact @biomejs/biome
npx biome init
npx biome check --write
Biome covers most common ESLint rules, but not every plugin. Check that the rules you depend on exist before you switch a large codebase.
Testing: Vitest and Playwright
Use Vitest for unit and component tests (it reads your Vite config, so aliases and plugins just work) and Playwright for end-to-end tests in real browsers:
npm install --save-dev vitest
npm init playwright@latest
npx playwright test
Playwright installs Chromium, Firefox and WebKit builds, so you can test Safari's engine on Linux and Windows CI runners. More options are in the testing tools directory.
API clients without an account
Bruno saves each request as a text file in your repository, so API collections get reviewed in pull requests like code. Hoppscotch runs in the browser and can be self-hosted for a team. Both are common free alternatives to Postman.
Backend and analytics you can self-host
- Supabase gives you Postgres with auto-generated REST and GraphQL APIs, auth and file storage. You can use the hosted service or run the open source stack with Docker. See our Supabase REST API quickstart.
- PocketBase is a single executable: download it, run
./pocketbase serve, and you get a database, auth and an admin dashboard. Good for prototypes and small apps; it scales vertically on one server. - Umami (MIT) and Plausible (AGPL-3.0) are privacy-focused analytics without cookie banners in many setups. Both are listed among free Google Analytics alternatives.
The license details that matter
"Open source" does not mean every license works the same way:
- MIT, BSD and Apache-2.0 (permissive): use, modify and ship in closed-source products. Keep the copyright notice. Apache-2.0 adds an explicit patent grant.
- MPL-2.0 (Penpot): changes to MPL-licensed files must be shared, but your own separate files can stay closed.
- GPL-3.0 (Zed): if you distribute a modified version of the tool, you must release your changes. Using the tool to write your own code does not put your code under the GPL.
- AGPL-3.0 (Plausible): like GPL, but offering a modified version as a network service also triggers the obligation to share source. Running it unmodified for your own site is fine.
The license of a tool you only use (an editor, a test runner) almost never affects your product. It matters when you modify and redistribute the tool, or embed it in what you ship.
Limitations to know
- Self-hosting is not free in time. Plausible, Umami, Supabase and Coolify are free to run, but you own backups, upgrades and security patches.
- Open core. Some projects keep advanced features in a paid hosted or enterprise edition. Check the feature list for the self-hosted version before you plan around it.
- Maintenance risk. Check the last commit date and open issue count on GitHub. A tool with no release in a year may not support the next version of your framework.
Finding more open source web tools on DevHunt
DevHunt lists developer tools launched by their makers, with an open source category you can browse by upvotes. If you maintain an open source tool, you can launch it there too; paid launches start at $19. Our guide on launching an open source project covers how to prepare the repo first.
FAQ
What are the best free open source web development tools?
For most projects: VS Code or VSCodium, Vite, ESLint and Prettier (or Biome), Vitest, Playwright, Tailwind CSS, and Bruno for API testing. Add Supabase or PocketBase if you need a backend, and Umami or Plausible for analytics.
Is VS Code open source?
The source code (the "Code - OSS" repository) is MIT licensed. The VS Code binary Microsoft distributes is built from that source but released under a Microsoft product license with telemetry. VSCodium is a community build of the same source under MIT.
Can I use open source tools in commercial projects?
Yes. Every tool in this list can be used to build commercial, closed-source software. License obligations apply when you modify and redistribute the tool itself, and for AGPL software, when you offer a modified version over a network.
What is the difference between open source and free tools?
Free means no price. Open source means the source code is published under a license that lets you read, modify and redistribute it. Many free tools (for example free tiers of SaaS products) are not open source, and some open source tools have paid hosted versions.
Which open source tools replace paid ones most directly?
Bruno or Hoppscotch for Postman, Umami or Plausible for Google Analytics, Penpot for Figma, PocketBase or Supabase for Firebase, and Coolify for Heroku-style hosting. Browse more in free alternatives.