Rebel Strike Force is a mod changing the regular HL2DM setup into a more on teamplay based game. A player can choose from 8 different classes to fill in a certain role in his team. There currently is only one gametype called "Objective". The idea is that you and your team mates try to complete a given mission while the other team tries to prevent that from happening.
Here are some screenshots showing one of the maps in RSF and also some game features.
Very empty, however there seems to be alot going on in this mod. I like that you are getting your ideas down, keep it up.