@Xerxes said in What is RektT5:

RektT5, also known as GetRekt T5M, is an alternative Client for Black Ops which allows mods and private ranked dedicated server hosting. It is the only BO client that is not based on outdated and dangerous leaked code from aIW. Unlike those clients RektT5 is based on the latest, unleaked version of 4D1’s T5m client. Custom maps and weapons are possible through the build in support for game_mod.