Man I used to be into The Specialists super fucking hard a few years back, but I'm so out of practice now every time I play it I get my ass handed to me. It's definitely one of the best HL1 mods, and does stuff with the goldsrc engine that I didn't think you could pull off. I really wish I was good at Kung Fu in that game, people who are good at it rape so much face it isn't even funny
Been playing Stalker:CoP with PRIPYATAN:ARMS, after giving it a try and shelving it because of the stupid difficulty curve, but now that I've gotten past the impossible early-game stage of having no decent suit and no effective weaponry, it's a hell of a lot of fun. It adds probably the largest array of weaponry in any mod I've seen outside of ARSENAL+OL for SoC, and one-ups most CoP mods (IE SMRTER) by providing unique stats and separate upgrade trees for each gun, which I really like. I'd recommend giving it a shot, if you need an excuse to play Call of Pripyat again and didn't like SMRTER (which I still think is the superior mod, in terms of balance), there's so many damn weapons, hahaha....