AspectC++
   A set of C++ language extensions to facilitate aspect-oriented programming with C/C++. Currently just a research prototype. [Freeware]
   http://www.aspectc.org/

AspectR
   Module adding simple aspect-oriented programming concepts to Ruby. Provides join points, advice, aspects, regexps, and pointcut parameters. [Open Source, LGPL]
   http://aspectr.sourceforge.net/

PostSharp
   Post-compiler for .NET; platform for analyzing or transforming .NET assemblies after compiling. One main use is Aspect-Oriented Programming, AOP/AOSD. allosw developing custom attributes that change the behavior of code. Open source.
   http://www.postsharp.org/

TransWarp
   A general purpose Aspect-Oriented Programming, Generative Programming, and CASE toolkit for Python. [Open Source, BSD-like]
   http://www.zope.org/Members/pje/Wikis/TransWarp/HomePage