Beyond Compare - Beyond Compare allows you to compare files and folders.
FileDiffs - Show diffs between the current file, or selection(s) in the current file, and clipboard, another file, or unsaved changes. - colinta/SublimeFileDiffs
WinMerge - WinMerge is an open source differencing and merging tool for Windows.
sublimious - Sublimetext plugin inspired by spacemacs and heavily focused on VIM
Meld - What is Meld? Meld is a visual diff and merge tool targeted at developers.
SideBar Enhancements - Provides enhancements to the operations on Sidebar of Files and Folders for Sublime Text.