Simraceway has recently launched their modder feature set. Here is an excerpt:

New Features;
Developers’ corner: A totally new section of the site dedicated solely to modding. It includes a
gMotor developer’s Wiki, ‘how to videos’, developer news section and collaboration tools.

1 click Install: Ability for mods to be downloaded from our high speed file servers and
automatically installed without any fuss, confusion or error.

Mod Syndication: Allows modders or mod users (if a modder permits this function to their mod
listing) to share a mod’s download link on any other website or blog.

To read the full PDF click this link: simraceway