ASP based wiki software requiring Microsoft IIS webserver and .NET framework. More info can be found at c2.
Homepage: http://flexwiki.com
Project: http://sourceforge.net/projects/flexwiki/
Some basic information: http://www.flexwiki.com/default.aspx/FlexWiki/WikiSpam.html
Check that you have a recent version of the flexwiki software, which includes the hyperlink blacklist feature. Use this to perform ContentBanning. Keep your blacklist up to date.
You will need to decide if you want to switch on nofollow for all links, or not. It is available in recent versions and switched on by default, but it is optional. You may decide you want to allow legitimate links from your wiki to boost page rank, however you then need to ensure that all links are legitimate.
See also the general AntiSpamRecommendations.
Despite this, they have failed to pay attention to even the most basic web design principles (no consistent navigation links/layout/colors), and cross-browser compatibility is hopeless. It also doesn't have EditSummaries, which makes despamming flex wikis extremely difficult. – Halz - 2005-04-19 21:12 UTC
I don't know much about this one. It is a Microsoft Shared Source (their version of Open Source) Wiki and uses its own odd syntax so has not interested me much. – Joe - 2005-04-19 21:19 UTC