Downsides to sharing: it's written in Winforms on .NET (though I expect it would work with Mono just fine); the UI is minimal to reduce clutter, and relies primarily on shortcuts: Alt+Left/Right to select "page" (= text file in directory) - pages are sorted in order of last edit; Alt+Up/Down to select revision (aka undo / redo / playback); middle-click mouse to paste if nothing is selected, or to copy if something is; and some searching etc.

Wrapping it all up nicely to share it, document it etc. would take at least another day, but I have many other things on my plate at the moment...