Filehippo - Filehippo is your key to opening files that Windows claims are "in use by another user" or simply "can't be found." Avoid the hassle.
Beyond Compare - Beyond Compare allows you to compare files and folders.
Softonic - Softonic is a website that offers downloads for free software and games.
WinMerge - WinMerge is an open source differencing and merging tool for Windows.
Softpedia - A library of over 1,000,000 free and free-to-try applications for Windows, Mac, Linux and Smartphones, Games and Drivers plus tech-focused news and reviews
Meld - What is Meld? Meld is a visual diff and merge tool targeted at developers.