I just today found this site, it's called the "GameDev Market."
Basically, they are going to be a platform for indie developers to buy and sell resources, and are currently in launch phase. RIght now you can submit resources, but they will not be public until May 30th.
Submission works as so: everything has to be approved, and they have a host of options related to selling. Some of which I've seen on the sell page are: Category, primary and secondary genres, pro or basic (which means what the buyer can use them for), tag and taglines, and whether or not they can be used for promotions (kinda like Steam Sales).
I believe they also support versioning, though I'm not entirely sure how that works, at the moment.