
OpenGrok
Sourcegraph
Atlassian Fisheye
Text Sherlock
Etsy Hound
Sourcebot
grep.app
Sourcegraph for GitHub
kdiff3
Beyond Compare
WinMerge
Meld
Araxis Merge
DiffMerge
P4Merge
Devart Code Compare
OpenGrok
kdiff3Sourcegraph - Sourcegraph is a free, self-hosted code search and intelligence server that helps developers find, review, understand, and debug code. Use it with any Git code host for teams from 1 to 10,000+.
Beyond Compare - Beyond Compare allows you to compare files and folders.
Atlassian Fisheye - With FishEye you can search code, visualize and report on activity and find for commits, files, revisions, or teammates across SVN, Git, Mercurial, CVS and Perforce.
WinMerge - WinMerge is an open source differencing and merging tool for Windows.
Text Sherlock - Provides a fast, easy to install and use search engine for text but, mostly for source code.
Meld - What is Meld? Meld is a visual diff and merge tool targeted at developers.