
ClassicPress
Sitecake
TYPO3
Anchor CMS
Textpattern
Flextype
ApostropheCMS
Microweber
kdiff3
Beyond Compare
WinMerge
Meld
Araxis Merge
DiffMerge
P4Merge
Devart Code Compare
ClassicPress
kdiff3Sitecake - Drag and drop CMS for HTML websites. It's flat file CMS so it's pretty fast.
Beyond Compare - Beyond Compare allows you to compare files and folders.
TYPO3 - TYPO3.com - Infos, SLAs, Extended Support Versions and more
WinMerge - WinMerge is an open source differencing and merging tool for Windows.
Anchor CMS - Free and lightweight blogging system
Meld - What is Meld? Meld is a visual diff and merge tool targeted at developers.