The Specialists is an action mod created by Filippo "Morfeo" De Luca and Lorenzo "John_Matrix" Pasini, built on by a strong willed community and the first multiplayer game ever featuring slowmotion. The standards of the First Person Shooter still apply but are augmented by an intuitive stunt system, slow motion action, hand to hand combat and an array of melee weapons, customizable firearms, particle effects and the ability to play from a third-person camera.
Has less gameplay potential than CS (a strange multiplayer deathmatch brother of TS) but it's cool from the time you first play it. Has new awesome keyboard features, lots of weapons, fun maps and even with bots it's cool. I don't know how difficult is find a server these days, but when played multiplayer, things get real. The characters for the player are nice and resembles a weapon specialist.
It's simple as: if you like Counter Strike, even a bit, this mod should be thousands more entertaining for you.