IntelliJ IDEA is a powerful, feature‑rich IDE for Java and many other languages, offering smart code completion, deep refactoring, and built‑in tools. If you’re looking for other development environments—whether you need a lighter editor, a different language focus, or a completely open‑source solution—here are 20 noteworthy alternatives.
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A mature, open‑source IDE with a rich plugin ecosystem supporting Java, C/C++, PHP, JavaScript, and more.
Microsoft’s free, lightweight code editor with a massive extension marketplace, excellent for web, cloud, and cross‑platform development.
An all‑in‑one open‑source IDE for Java, PHP, HTML5, and C/C++, featuring built‑in project management and profiling tools.
Google’s official IDE for Android development, based on IntelliJ IDEA but tailored with Android‑specific tools and emulators.
Full‑featured, enterprise‑grade IDE for .NET, C++, Python, and many other languages on Windows.
A fast, cross‑platform text editor with powerful shortcuts, a rich plugin ecosystem, and a focus on code editing speed.
GitHub’s hackable, open‑source editor that supports a wide range of languages via community packages.
Free, open‑source IDE primarily aimed at C, C++, and Fortran development with a modular plugin architecture.
Apple’s integrated development environment for macOS, iOS, watchOS, and tvOS, supporting Swift, Objective‑C, and C++.
JetBrains’ free edition focused on Python development, offering intelligent code assistance and debugging.
A cross‑platform .NET IDE from JetBrains, combining ReSharper’s refactoring power with a modern UI.
Highly extensible, keyboard‑centric editor that can be turned into a full IDE via packages like LSP-mode.
Modal text editor known for speed and efficiency; plugins such as coc.nvim add IDE‑like features.
Educational Java IDE designed for teaching object‑oriented concepts with visual class diagrams.
Integrated development suite for Java, XML, SQL, and Oracle ADF, with built‑in debugging and profiling.
Lightweight Java IDE aimed at beginners, offering a simple interface and interactive console.
Web‑development focused IDE built on Eclipse, supporting HTML, CSS, JavaScript, and Ruby.
Cross‑platform IDE for dynamic languages (Python, PHP, Ruby, Node.js) with debugging, unit testing, and collaboration tools.
Small, fast IDE that supports many languages, offering basic IDE features without the overhead of larger tools.
Interactive development environment that provides real‑time feedback and inline evaluation for JavaScript, Python, and Clojure.