Well, I just discovered rave.dj a few days ago. It lets you combine any two songs, and it either turns out amazing, or absolutely terrible. It’s also really cool because it pitch shifts the songs to be in the same key (or at least close). Unfortunately, you can’t really use songs with key changes because it doesn’t know what to do.
I just look for maps. Maps usually don't break when updates come out and if they do they don't destroy the game. The one mod I really liked was discontinued because of the dev lighting change back when .10 came out.
Agreed, I like looking for car mods on beamng, and creating my own in my lots of downtime. I really put my heart into my Muscle Car Pack. I just love that mod I uploaded. Sorry, got a bit off-topic.
-This site, of course. -I also like some of the snarkier wikis, such as the Bad Webcomics wiki and Rational wiki. -Dilbert.com -This old and unsupported part of wreckedexotics.com: http://www.wreckedexotics.com/newphotos/other/ , purely for nostalgic purposes. -Hell, any old sites that I used when I was like 5.