Ryder25
Various DiRT series tools / mods.

Mesa's Artwork
Liveries for all the complete DiRT series and more.

DiRT Modders Resource
Modifications and liveries for DiRT 3, DiRT Rally & DiRT Rally 2.0 as well as tools and information.

Ameblo.jp/dirt23
Downloads for DiRT 2, DiRT 3, DiRT Rally, DiRT4 & DiRT Rally 2.0 liveries.

Cmr2cars by NOR
One of the best CMR2 3D and Livery creator. Recently updated with 2012, 2013 and 2014 liveries.

ArnoRallye
Cool liveries and more for the game DiRT Rally, DiRT4 & DiRT Rally 2.0. Website is in French language only.

DiRT Lounge
Very nice variations and beautiful liveries for the games DiRT3, DiRT Rally, DiRT4 & DiRT Rally 2.0.