You can find most of the kotor mods hosted on Filefront at: http://www.gamefront.com/files/listing/gamingfiles/Knights_of_the_Old_Republic/
and most of the kotor 2 mods at: http://www.gamefront.com/files/listing/pub2/Star_Wars_Knights_of_the_Old_Republic_II_The_Sith_Lords
Gamefront is where most of the Filefront's mods were stored and all Filefront downloads went through gamefront. Most of the content isn't lost, just Filefront
You can also use archive.org to view the old mod descriptions. Archive.org is a site that allows you to view previous versions of a website, including non-existant ones
Quite a few Filefront mods have been transplanted here (with permission by the original authors) and many have been re-posted elsewhere (some with permission, some without). There is an extensive discussion on the topic of re-posting mods that aren't your own here on deadlystream: http://deadlystream.com/forum/topic/3421-why-its-not-okay-to-upload-someone-elses-mods/
Hope that answers everything.