My name is SunSpot and I am the team leader for Frontline Force. Let's see if i can straighten this out a bit.
As for the Counterstike bit... Frontline Force is nothing like CS/CSS at all, except they are/were mods to Half-Life originally. Gameplay is entirely different in every single aspect except for the fact both games use modern weapons. Adrian Finol, the person credited with creating Frontline Force in 2000, was hired by Valve in 2001 and is a Sr. Programmer there. We met last year when I visited Valve and he gave us his "blessing" to continue to develop the game. Frontline Force has always been a community driven thing anyway. So we are now the team moving it to Source. Since it's original development, 3 programmers who have taken on FLF since Adrian left, have all been hired by major software companies. This would be David Dynerman 2001-2003 (Raven/Id Software), Tony Sergi 2003-2005 (Leaping Lizards Software), and Andrew Spiering 2006 (Blizzard Software). Each time this happens, a void is left till someone else comes along. We are looking to fill this void.
As for Programming, code for all HL2 Source mods are written in C++ and compiled with either vs2003 or 2005. There is no need for the "original" source code, as Valve supplies a nice SDK with base code for Mod developers. (as mentioned by Cerebus above)
We do have Code now and a "semi" functional game. This code, however, needs merged with the newest SDK. (Valve changed some things recently)We also have a couple of part time programmers lacking the time to fully complete it. We need someone to help us wrap up this SDK merge, optimize some things, add in some more of the features, and follow this through to a completed Beta at least. The optimum canidate would need to be a bit familiar with Valve games, whether its CS:S, DOD:S, or TFC. Since they all share the same "Base Code" and engine. This person would also need to at least play the old version of FLF or have played it before. Its not a requirement, but would be nice.
FLF has always been a fun game under HL1 engine and had hundreds of servers and a thousand players at one time. Since Source and HL2 came out, it has died pretty much, which is why we want to get this show on the road.
Sorry we cant pay, but if you happen to be in Central Florida, I'll buy ya some beer and a cheap ho.
you can email me... SunSpot (at) frontlineforce2 (dot) com