| Artistic Style | Java Source Code Indentation Filter |
| Barat | Code Parser/Analyser |
| CheckStyle | Java Coding Convention Checker |
| ImportScrubber | Java Import Optimizer |
| Jacobe | Java Source Code Formatter (not Open Source, but free) |
| JCSC | Java Coding Style Checker |
| JRefactory | Java Refactoring Tool |
| Mozart Development Environment | Framework for user extensible compilers and development tools |
| PMD | Java source code analyser/checker |
| QDox | Framework for extracting class/interface/method definitions |
| Recoder | Source Code Metaprogramming Framework |
| RevJava | Review assistant for Java programs |
| Transmogrify | Java Refactoring Tool |