I found a Half-Life 2 mod that shares some similarities to Brink. It's called Dystopia, and there is a "Punk Rebel team" and a "Corporate Security" team. You can pick a light, medium, or heavy body type. Each class has its own unique weapons. The light body type can use jump boosters to leap to a ledge, then grab it and pull themselves up. Although there aren't classes persay, you can equip characters with abilities that can let them heal themselves and others, hack computers, or a short term invisibility. The heavier the weight type, the more energy you have for these abilities. The few maps I've seen are all attack/defend, where one team attacks sequential objectives and the defending team, well, defends. Search for it on Steam, or here's the official link. http://www.dystopia-game.com/
Enjoy.