Beyond Compare - Beyond Compare allows you to compare files and folders.
Westlaw - Legal Research
WinMerge - WinMerge is an open source differencing and merging tool for Windows.
BlinkLegal - Legal Document Management
Meld - What is Meld? Meld is a visual diff and merge tool targeted at developers.
Doctrine - An object-relational mapper for PHP that provides transparent persistence for PHP objects.