anyone has source code of well know multiplater games?

HI .if anyone has legal source code or engine of a well known multiplayer game to reskin it please bid on this project .I need someone experienced who is familiar with the code and add some basic features to source and re skin it . the game can be anything like battlefield to racing or any other engine of well know multiplayer games are welcome . please bid on this project if you have a good profile and at least your own i tune or Google play products .remember the game should be well known I know a lot of website are selling different codes but I'm looking for game engine similar to popular multiplayer games on IOS and android Thank you Frank