Q: OMG YUO STOLED NS!!!1!A: No. Development on Tremulous began long before NS was in the public domain. If Tremulous is inspired by anything, it is inspired by Gloom for Quake 2. NS has a similar ancestry (please see Game Developer Magazine February 2001 issue); this is probably where the confusion arises. This answer is not intended to be a sleight against NS in any way, shape, or form, only this "observation" comes up a lot, and it becomes frustrating to answer the same thing over and over again.