WinMerge - WinMerge is an open source differencing and merging tool for Windows.
Meld - What is Meld? Meld is a visual diff and merge tool targeted at developers.
kdiff3 - KDiff3 is a file and directory diff and merge tool which compares and merges two or three text...
FileZilla - FileZilla is an FTP, or file transfer protocol, client. It lets individuals transfer single files or batches to a web server. For many years, FTP was the standard for website design. Read more about FileZilla.
P4Merge - A valuable tool for diagnosing continuous integration bugs, Folder Diff also measures how much code must be resolved in pending merge scenarios. Visually compare two versions using image diff within P4Merge to determine changes made.
PuTTY - Popular free terminal application. Mostly used as an SSH client.