Rysa, could you perhaps update the OP with links not just to the downloads themselves, but to sites with information about the various mods - or simply add more information?
For example, "Rules of Engagement" says "additional maps, weapons etc." and then simply a download link. No info about what it actually is or how it works. The sources I've managed to find are several years old and it seems to be a total conversion with it's own storyline. Which is it? What does it actually do, add, etc?
And then there's "Realistic guns" without so much as a comment. :p