Best Open-Source IDEs 2026: 6 Options Compared
Best open-source IDEs compared: VSCodium, Eclipse IDE, Apache NetBeans, Zed and 2 more, with licenses, platforms and prices from official pages checked October 28, 2026.
•3 min read•Code Editors, IDEs & Playgrounds
Quick comparison
| Tool | Price | Platforms | Best for | Tested |
|---|---|---|---|---|
| VSCodium | Free (community builds of VS Code source with telemetry disabled) | Windows, macOS, Linux | The VS Code experience without Microsoft builds | Docs only |
| Eclipse IDE | Free (Free open-source software) | Windows, macOS, Linux | Java and plug-in based development | Docs only |
| Apache NetBeans | Free (Free open-source software) | Windows, macOS, Linux | Java projects with built-in tooling | Docs only |
| Zed | Free (Personal plan at $0, used with your own API keys or external agents; Zeta edit predictions are listed under paid plans); paid from $10 per month (Pro, includes $5 of AI tokens) | macOS, Linux, Windows | Fast editing with collaboration | Docs only |
| Lapce | Free (open-source editor written in Rust) | Windows, macOS, Linux | Lightweight, quick editor | Docs only |
| Eclipse Theia | Free (Free open-source software) | Web browser, Desktop app | Teams building their own IDE | Docs only |
Independent comparison. Paid placements are labelled separately; editorial links earn no affiliate commissions. Learn more.
Good fit if
- You want VS Code without the Microsoft build (VSCodium is the pick)
- You write Java (Apache NetBeans is the pick)
- You want the plug-in IDE with the longest history (Eclipse IDE is the pick)
- You want a very fast editor (Zed is the pick)
- You are building a cloud IDE (Eclipse Theia is the pick)
Not ideal if
- You cannot host, patch and back up a server yourself and want a vendor to run it
The word IDE covers heavy, language-aware environments and light editors with plugins, and the open-source field has both. Eclipse and Apache NetBeans are full IDEs, long associated with Java, with debuggers, build integration and refactoring built in. They are free under EPL-2.0 and Apache-2.0, but they feel heavier and older than modern editors. VSCodium is Visual Studio Code's source built without Microsoft's telemetry, with the extension catalog replaced by Open VSX, so a few extensions will not be available. Zed and Lapce are newer editors written for speed, with built-in collaboration in Zed's case, though language support is thinner. Eclipse Theia is not a product you install for daily work but a framework for building IDEs, in the browser or desktop, and it will appeal to teams making cloud development environments. The trade-off is polish against freedom. The best-supported setup for most languages today is a Code-based editor, while the true IDEs offer deeper tooling in their home languages. Before switching, check the language server for your stack, the debugger and the project tooling you rely on, then try a real project for a week. Editor choice is a habit, so give a new one time before judging.
VSCodium
MIT community builds of the VS Code source with telemetry disabled. It uses the Open VSX registry, so some extensions with restrictive licenses may not work.
Price: Free (community builds of VS Code source with telemetry disabled) (VSCodium pricing, checked 2026-10-22).
Platforms and license: Windows, macOS, Linux. MIT (open source) (license source).
Project activity: 33.8k GitHub stars · latest release 1.143.17183 (Oct 26, 2026) · last commit Oct 27, 2026
Best for: The VS Code experience without Microsoft builds.
Worth knowing: It uses the Open VSX registry instead of Microsoft's Marketplace, so some extensions with restrictive licenses may not work.
Eclipse IDE
EPL-2.0 full IDE for Windows, macOS and Linux; individual plug-ins can carry other licenses. Free.
Price: Free (Free open-source software) (Eclipse IDE pricing, checked 2026-10-23).
Platforms and license: Windows, macOS, Linux. EPL-2.0 (open source) (license source).
Project activity: 171 GitHub stars · last commit Oct 27, 2026
Best for: Java and plug-in based development.
Worth knowing: Licence is that of the eclipse.platform repo; individual plug-ins can differ.
Apache NetBeans
Apache-2.0 IDE from the Apache Software Foundation, running on a JDK. Free, with Java as its traditional strength.
Price: Free (Free open-source software) (Apache NetBeans pricing, checked 2026-10-24).
Platforms and license: Windows, macOS, Linux. Apache-2.0 (open source) (license source).
Project activity: 3.1k GitHub stars · latest release 31 (Aug 5, 2026) · last commit Oct 26, 2026
Best for: Java projects with built-in tooling.
Zed
GPL-3.0 editor with a free Personal plan used with your own AI keys. Pro is $10 a month if you want its hosted AI.
Price: Free (Personal plan at $0, used with your own API keys or external agents; Zeta edit predictions are listed under paid plans); paid from $10 per month (Pro, includes $5 of AI tokens) (Zed pricing, checked 2026-10-28).
Platforms and license: macOS, Linux, Windows. GPL-3.0 (open source) (license source).
Project activity: 92.3k GitHub stars · latest release v1.25.3 (Oct 23, 2026) · last commit Oct 27, 2026
Best for: Fast editing with collaboration.
Compare: Zed alternatives
Lapce
Apache-2.0 open-source editor written in Rust, aimed at speed. Language support is smaller than the larger ecosystems.
Price: Free (open-source editor written in Rust) (Lapce pricing, checked 2026-10-22).
Platforms and license: Windows, macOS, Linux. Apache-2.0 (open source) (license source).
Project activity: 39k GitHub stars · latest release v0.4.6 (Jan 21, 2026) · last commit Oct 9, 2026
Best for: Lightweight, quick editor.
Eclipse Theia
EPL-2.0 framework for building cloud and desktop IDEs in TypeScript. It is a base for products, not a finished editor.
Price: Free (Free open-source software) (Eclipse Theia pricing, checked 2026-10-24).
Platforms and license: Web browser, Desktop app. EPL-2.0 (open source) (license source).
Project activity: 21.7k GitHub stars · latest release v1.76.0 (Sep 24, 2026) · last commit Oct 27, 2026
Best for: Teams building their own IDE.
Worth knowing: A cloud and desktop IDE framework in TypeScript per the repository description. It is a base for building IDEs rather than a finished product.
Which one to pick
- You want VS Code without the Microsoft build: VSCodium
- You write Java: Apache NetBeans
- You want the plug-in IDE with the longest history: Eclipse IDE
- You want a very fast editor: Zed
- You are building a cloud IDE: Eclipse Theia
Limits of this review
Docs-only for VSCodium, Eclipse IDE, Apache NetBeans, Zed, Lapce, Eclipse Theia: we did not install or run them, so feature claims come from vendor pages. Vendor prices and free limits change; confirm on the linked pricing page before you commit.
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Kevin Fan
Kevin Fan is a SaaS founder. He runs Free Instead Of, which tracks free and open-source alternatives to paid software and checks each price and free-plan limit against the vendor's own pages.
Methodology
Based on official pricing, license and product pages checked between 2026-10-22 and 2026-10-28: VSCodium, Eclipse IDE, Apache NetBeans, Zed, Lapce, Eclipse Theia. Prices, free limits and licenses are the figures shown on those pages on those dates. No tool on this page was installed or run. No accounts were created.