vim-addon-ruby-debug-ide (GitHub: MarcWeber / vim-addon-ruby-debug-ide) by Marc Weber may not have the most original name, but nonetheless it's an interesting ruby debugging interface for
ruby-debug-ide19. It supports stepping, breakpoints, variables, and restarting the process. It requires a patched version of
ruby-debug-ide19, and is still at an early stage.
The interesting thing about Splice is it's inspired by Adobe Lightroom rather than traditional diff tools. Like Lightroom, Splice has several modes that present files and their changes in various ways. To see it in action, take a look at Steve's Splice screencast.