Bicycle Repair Man - Open source refactoring browser for Python that automates refactorings. Named after a super-hero in a Monty Python skit.
XP Software - Testing Framework software for many languages, facilitates refactoring. Proper refactoring without good tests is very difficult.
Xrefactory - Development tool extending Emacs and XEmacs editors by intellisense code completion, source browsing, and refactoring functions. May be the first C and Java refactoring tool.
