Open Source Development Tools Developers Rely On (2026)

The open source development tools most developers use every day are Git, a language runtime such as Node.js or Python, an editor like VS Code (Code - OSS) or Neovim, containers via Docker Engine or Podman, and a database like PostgreSQL. Below is a list of community-built tools by category with their licenses, plus the part most lists skip: how to check that a tool is actually open source, and which popular tools changed their license in the last few years.

Licenses below were checked against each project's repository or official site as of October 2026.

What counts as open source software

"Free to download" is not the same as open source. Open source software is released under a license approved by the Open Source Initiative, which lets you use, study, modify and redistribute the code, including commercially. Two families matter in practice:

• Permissive (MIT, BSD, Apache 2.0): use it almost any way you like, including in closed-source products. Keep the copyright notice.
• Copyleft (GPL, AGPL, MPL): if you distribute modified versions (or, for AGPL, run them as a network service), you must share your changes under the same license.

"Source-available" licenses such as the Business Source License (BSL), SSPL or Elastic License let you read the code but restrict some uses, usually offering it as a competing hosted service. They are not OSI-approved.

Open source development tools by category

Version control and code hosting

Tool	What it is	License
Git	Distributed version control, created by Linus Torvalds in 2005	GPL-2.0
Forgejo	Self-hosted Git forge (issues, PRs, CI)	GPL-3.0+
GitLab Community Edition	Self-hosted DevOps platform	MIT

New to Git? Start with our guide to open source version control for beginners.

Languages and runtimes

Tool	License
Python	PSF License
Node.js	MIT
TypeScript	Apache 2.0
Go	BSD-3-Clause
Rust	MIT / Apache 2.0
OpenJDK	GPL-2.0 with Classpath Exception

Editors and IDEs

Tool	Notes	License
Code - OSS / VSCodium	The open source core of VS Code; VSCodium ships it without Microsoft telemetry and branding	MIT
Neovim	Terminal editor with Lua plugins and built-in LSP	Apache 2.0 / Vim license
Zed	Fast, collaborative editor written in Rust	GPL-3.0 (editor)
Eclipse IDE	Java-first IDE	EPL-2.0

One detail many people miss: the Visual Studio Code download from Microsoft is built from the open source vscode repository but ships under a Microsoft product license, and the Marketplace terms limit it to Microsoft's products. If you need a fully open source build, use VSCodium with the Open VSX extension registry. For a broader comparison, see popular IDEs compared.

Containers and infrastructure

Tool	What it is	License
Docker Engine (Moby)	Container runtime and CLI	Apache 2.0
Podman	Daemonless, rootless containers	Apache 2.0
Kubernetes	Container orchestration	Apache 2.0
OpenTofu	Open source fork of Terraform under the Linux Foundation	MPL-2.0
Ansible	Agentless configuration management	GPL-3.0

Docker Engine is open source, but Docker Desktop is not. Docker's subscription terms require a paid plan for professional use in larger companies (250+ employees or more than $10 million in annual revenue). Podman Desktop and Rancher Desktop are open source alternatives.

Databases and caching

Tool	License
PostgreSQL	PostgreSQL License (permissive)
SQLite	Public domain
MySQL Community	GPL-2.0
Valkey	BSD-3-Clause
Redis 8+	Choice of AGPL-3.0, RSALv2 or SSPLv1

Frameworks

Tool	License
React	MIT
Vue	MIT
Django	BSD-3-Clause
Ruby on Rails	MIT
Next.js	MIT
Laravel	MIT

We cover frameworks in more depth in top open source frameworks.

Testing, CI and quality

Tool	What it is	License
Playwright	Browser end-to-end testing	Apache 2.0
Selenium	Browser automation (WebDriver)	Apache 2.0
Jest / Vitest	JavaScript unit testing	MIT
pytest	Python testing	MIT
ESLint	JavaScript linting	MIT
Jenkins	Self-hosted CI server	MIT

License changes you should know about

Several widely used developer tools moved away from open source licenses, and in most cases the community forked them. If you depend on any of these, check which version you run.

Project	What happened	Open source option
Terraform	HashiCorp moved it from MPL-2.0 to the BSL in August 2023	OpenTofu (MPL-2.0)
Redis	Moved to RSALv2/SSPL in March 2024; Redis 8 (May 2025) added AGPL-3.0 as an option	Valkey (BSD) or Redis 8 under AGPL
Elasticsearch	Moved to Elastic License/SSPL in 2021; AGPL-3.0 added as an option in 2024	OpenSearch (Apache 2.0) or Elasticsearch under AGPL

The lesson: a license is a property of a specific version, not of a product name. Pin versions and check the LICENSE file when you upgrade a dependency your business relies on. Our free and open source alternatives pages, such as the one for Terraform, list maintained options.

How to check a tool before you adopt it

1. Read the LICENSE file in the repository root, and check the SPDX identifier in package.json, Cargo.toml or pyproject.toml.
2. Confirm it's OSI-approved on the OSI license list. "Fair source", BSL and SSPL are not.
3. Check who owns the copyright. A project run by a foundation (Linux Foundation, Apache, CNCF) is much less likely to change its license than one owned by a single company that requires a CLA.
4. Look at maintenance, not stars: recent releases, how fast security issues are fixed, and whether more than one or two people merge PRs.
5. Scan your dependencies. Tools like npx license-checker --summary (npm) or pip-licenses (Python) list licenses across your dependency tree.

npx license-checker --summary
# ├─ MIT: 412
# ├─ ISC: 38
# ├─ Apache-2.0: 21
# └─ BSD-3-Clause: 9

How to contribute back

Community-built tools stay healthy when users help. You don't need to write core features:

• Report bugs with a minimal reproduction.
• Fix documentation, which most maintainers welcome.
• Look for good first issue labels on GitHub.
• Sponsor maintainers through GitHub Sponsors or Open Collective if your company depends on a project.

If you build an open source tool yourself, you can find new ones and share yours in open source tools on DevHunt.

FAQ

What are examples of open source software?

Linux, Git, Python, Node.js, PostgreSQL, Kubernetes, Firefox, VSCodium and LibreOffice are all open source. Each is published under an OSI-approved license that lets anyone use, modify and redistribute it.

Is VS Code open source?

The source code is: the microsoft/vscode repository is MIT-licensed. The Visual Studio Code binary you download from Microsoft is released under a Microsoft product license. VSCodium is a fully open source build of the same code.

Is open source software free?

Free to use, yes, in almost every case. But some projects sell hosted versions, support or extra features. And "free" downloads like Docker Desktop are not open source and can require a paid license at work.

What is the difference between open source and source-available?

Open source licenses (MIT, Apache, GPL and others on the OSI list) allow any use. Source-available licenses (BSL, SSPL, Elastic License) let you see the code but limit some uses, usually running it as a competing hosted service.

Which open source development tools should a beginner install first?

Git, one language runtime (Node.js or Python), an editor (VSCodium or VS Code), and later Docker Engine or Podman and PostgreSQL. That covers most tutorials and real projects.