WagN

Structured Wiki, renamed Decko? https://decko.org/

2009-06-10-Wagn1Released

John Abbe http://www.wagn.org/wagn/John_Abbe http://johnabbe.wagn.org/

Blurgh lots of Free Link-s being used. I think that's a challenge to really getting InterWiki going.

Is it still Ruby On Rails since their replacement of MVC with MoVE?

Open Source https://github.com/decko-commons/decko

or paid hosted WikiFarm