Well, I'll tell you a little, but I immediately warn you what the mod did for itself and did not plan to spread it. Mod works only with X-com files. Only Russian language. Worked well with the openxcom_xfiles_0.9.5.1 version. With the newer began to conflict, I will need to look for errors.
Of course, the mod adds new weapons, armor, transportation, research, etc. The mod also actively uses X-com resources for research and production. The mod adds the ability to perform interception missions almost from the very beginning of the game (in the original X-files with this problem) using hired transport against the cultists. And it is likely to get an early base attack from angry cultists (something like pirates). I am also interested in the dark side of X-com. There is a line of research on illegal activities, which allows to bypass the Council to buy smuggling, drugs, weapons, prostitutes and conduct illegal experiments on people and aliens.
I also develop the idea of "fraternity" inside X-com, a cell that is not subordinate to the Council. It is based on the Imperial Guard (X-Guard) and the Space Marines (Brotherhood X-com). All resources are taken from the Warhammer40K mod. That's basically all. I tried to keep my uploads in line with the spirit of the original X-com and X-com files.