
Azendoo
Trello
Asana
Basecamp
Jira
Wrike
Redmine
Active Collab
kdiff3
Beyond Compare
WinMerge
Meld
Araxis Merge
DiffMerge
P4Merge
Devart Code Compare
Azendoo
kdiff3Trello - Infinitely flexible. Incredibly easy to use. Great mobile apps. It's free. Trello keeps track of everything, from the big picture to the minute details.
Beyond Compare - Beyond Compare allows you to compare files and folders.
Asana - Asana project management is an effort to re-imagine how we work together, through modern productivity software. Fast and versatile, Asana helps individuals and groups get more done.
WinMerge - WinMerge is an open source differencing and merging tool for Windows.
Basecamp - A simple and elegant project management system.
Meld - What is Meld? Meld is a visual diff and merge tool targeted at developers.