Theres Smart Media Tokens, you might want to check this website and you will find whitepaper there:
https://smt.steem.io/ I do believe they are not lunched on the platform yet.
If you are looking to fork the steemit blockchain, it shouldn't be to hard if you are good with programming. As you will have to change few parametars and import your name not steem. However for anything advanced you will have to know more or even hire somebody.