RubyMass: Introspect the Ruby Heap by indexing, counting, locating references and releasing objects
RubyMass can help you tackle memory leaks as you can list (and count) which Ruby objects (Ruby mass :D) are in memory. Also, you can locate references to a certain object and remove them if wanted. Try out RubyMass and feel free to send in pull requests and/or suggestions. See more at the Github page of RubyMass.