TWiki, enterprise wiki enterprise collaboration platform

Twiki:
Welcome to TWiki, a flexible, powerful, and easy to use enterprise wiki, enterprise collaboration platform and knowledge management system. It is a Structured Wiki, typically used to run a project development space, a document management system, a knowledge base, or any other groupware tool, on an intranet or on the internet. Web content can be created collaboratively by using just a browser

compare different Wikis
Testimonials
Success Stories: SAP when SAP( and yahoo ) are using this should be the best enterprise wiki-- lots of high end corporations, seems paypal is also using it.
Texas Instruments - read all success stories you get problems they solved ..
good Twiki pdf presentaton
-reviews: "Wikis have changed the way we run meetings, plan releases, document our product and generally communicate with each other" - Eric Baldeschwieler, Director of Software Development of Yahoo!

TWiki Plugins: Enhance the TWiki functionality with server side Plugin modules. Developers can create Perl Plugins using the TWiki Plugin API. Some example Plugins:
- It seems all teh Twiki programming is in PERL


Database Plugin
Provide secure access (read and write) to data in an SQL database, with flexible results formatting.Any database that has a DBI interface can be used.
examples:
let's say you wanted to display the next two upcoming scheduled events in the Kalendus calendar.

%DATABASE_SQL{description="calendar_events" command="SELECT subject,body,startdate FROM kalendus_event WHERE to_days(startdate) > to_days(now()) order by startdate limit 2" format="$startdate
$subject
$body"}%
_____________________________________________________________________________

Twiki seems good for enterprise where you have your sensitive project data connectivity to databases . The following may be more for general purpose small shop easy setup project Wikis ..

PBWiki Gets An Overhaul - comparision of google sites etc ..
As Google gets into the wiki space with Google Sites (the relaunch of Jotspot), all the other little wiki startups out there will need to keep one step ahead. Those includes Wikia, Socialtext, Wetpaint, and PBWiki. As it approaches 500,000 wikis, PBWiki is now putting the 2.0 version of its site into beta. The latest version includes an updated UI, folders, enhanced access controls and an easy way to customize the look and feel of your wiki page (see the screenshot of a customized TechCrunch page below or this generic demo page). The 2 million people a month that the company says visit PBWiki should like that.

google sites -- see the sample sites they are interesting UI




_____________________________________________________________________________