Aspect-oriented Java extension, seamless, from Xerox PARC. Goal: to make aspect-oriented programming (AOP) technology available to a wide range of programmers. [Open Source, MPL]

PROgrammable extenSions of sErvices; allows modifying Java programs at run-time; dynamic aspect-oriented programming (AOP), adaptive service architectures, and information systems for mobile computing.

Helps enforce architectural rules (layering, tiering, and modularity) in Java code. It applies pattern-based access rules from XML rules files to compiled classes. [Open source, GPL]

Dynamic, lightweight and high-performing AOP framework for Java; uses bytecode modification to weave classes at project build-, class-load-, or run-time. [Open Source, LGPL]

Very small and fast Java bytecode manipulation framework; can be used to dynamically generate stub classes or other proxy classes, directly in binary form, or to dynamically modify classes at load time, just before loaded into a JVM. [Open Source, BSD]

The distribution of an optimising, extensible compiler for AspectJ, freely available under the LGPL. The abc project is a joint effort between the University of Oxford (UK), McGill University (Canada), and the University of Aarhus (Denmark). [Open sou...

A general-purpose aspect language (GPAL) based on Java, with aspect reflection.

A tool for Java (with optional Emacs support) which helps developers to find and visualise crosscutting concerns, using text matching. [Freeware]

A Java tool supporting advanced Multi-Dimensional Separation of Concerns. [Freeware]

An adaptive programming language based on Java. The "big sister" of DJ.