SCP is probably the largest and most successful collaborative fiction project on the internet. It is presented as a series of database entries on SCPs, or "skip

SCP is probably the largest and most successful collaborative fiction project on the internet. It is presented as a series of database entries on SCPs, or "skips", which are anomalous objects, entities, or events that the SCP Foundation has contained or would like to contain if they could figure out how. It is largely horror themed. There are also "Tales" which are simply stories set in the SCP-verse. Like anything, 90% of it is kinda crap, but that last 10% can be really really good.