Tom is a software environment for defining transformations in Java.

Tom is an extension of Java designed to manipulate tree structures and XML documents.
Tom is compatible with Java: any Java program is a correct Tom program.
Data are represented using an efficient object oriented tree based data-structure.
Java builtins (int, char, String, etc) can be used.
Tom provides pattern matching facilities to inspect objects and retrieve values.
A powerful strategy language can be used to control transformations.
Tom is used in several companies to implement transformations of programs and queries.

[2008-09-01] a new wiki is under construction
[2008-08-27] we now have a Java parser (based on Antlr 3.1) that builds a Gom term (ready for strategy transformation)
[2008-08-26] FreshGom in preparation
[2008-04-11] Tom 2.6 Release is out
[2008-04-08] Tom 2.6 Release Candidate 2 is out
[2008-04-08] A nice post introducing Tom by Luis Diego Fallas [part 1| part 2| part 3]
[2007-11-20] Term-graph rewriting in Tom An example in the guided tour
[2007-10-16] Integrating Tom in an existing Java application that uses Java Persistence API: Video

What is Tom? What's it good for? What target languages can it handle? Why is it called Tom?

What have been done with Tom? From sexy Boulderdash demo to serious prover and compiler implementations.

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Download a stable or development release of Tom. Get scripts and modes for Emacs or Vim.

Tutorial, language reference manual, user guide, cookbook, and academic publications can be found here.