When I migrated to Ubuntu I loose some important developer tools like UltraEdit and Beyond Compare two closed-source commercial applications representing the state-of-art like editor and file comparator.
Folders and files comparison tools under Gnome are poor so I’ve decided to create my own differ application based on KomodoEdit for at least three reasons
KomodoEdit is open source
KomodoEdit is XUL based so I can develop re-using my know-how
KomodoEdit is multiplatform (thanks to Mozilla Gecko Engine)
Finally I’ve finished the first stable version of VisualDiffer, it misses many features but I hope to add them.