Here you can find a nice tool to compare WIKI's.
The list for reference:
Alfresco, the leader in open source enterprise content management (ECM) solutions, today announced that the SAP Global IT team has selected Alfresco Enterprise as it global standard for document collaboration, content management and publishing.
Tweet this: #Alfresco provide collaborative content publishing backbone for SAP.
Google Cloud Connect for Microsoft Office is essentially a plugin for Windows versions of the productivity suit (2003, 2007, 2010).
The plugin syncs your work through Google's cloud, so everyone can contribute to the same version of a file at the same time.
XeniT made a prototype for such functionality in 2008 for an IWT market study. Vision was right, Google has a bit more funding :-).
See the whole presentation in this video:
Release date 2nd November, 2010
In Fred 1.2 we continued to enhance the browsing experience. New tab controls and robuster multi document drag and drop processes are introduced.