There is some good looking wet rainy shader of Torque3d:
http://vimeo.com/2814500More infos about the developer of this shader are here:
http://www.garagegames.com/community/blog/view/16083/2#commentsIf you did not follow the news: The upcoming Torque3d version will have a
significantly higher price. But they told it will be a cheaper upgrade path from
TGEA customers. The feature set of T3D is not officially announced yet but it
is told to read Collada files, gets better documentation, more modular source
code and lots of new shaders (ambient occlusion as an example).
But it also has to face a hard competition now. Unity will enter Windows
market, C4 got a great terrain (with option to sculpt caves, overhangs) and
Shiva is very cheap now.