Attn: On mod DB, there is a dude called petrick who is uploading a gamut of old mods for HL1. I like this guy. I recommend you to go to the Mod DB right now and download all the mods that were previously available only to people who could find foreign downloads. Now that you downloaded some of those excellent mods, you can find that the standard deviation of the quality of all those mods is really high (not necessarily a good thing).
This month we are going to discuss a mod called Robotech: Invasion (not on moddb). I cannot believe I did not find this mod earlier than I did, although whether it still exists is subject to debate. This mod features an unfinished training course, and unfinished main game also. But boy, would you wish it were finished! Lemme tell you, in addition to (poorly-modeled) new monsters, EVERYTHING HAS A CARTOON SKIN! Yep, all the items, weapons, and especially monsters are remodeled with cartoonish skins. The grunts are remodeled high definition, but their skins are not cartoonish, for some reason.
My favorite part (and maybe yours too, once you find it somehow) is all the new weapons. If I recall correctly, there are about 4 handguns, 4 submachine guns, and 3 protoculture weapons. I just want to say that all the weapons are roaring awesome, but maybe that's because the game makes headshots do way more damage. The only flaw in this game is boring boxy architecture, but that doesn't seem so important when you have roaring awesome weapons, in my opinion. Too bad it's unfinished though, I think it would turn out really gnarly if it was, what with bland architecture, crazy weapons, grunts who use more than a mp5 and shotgun (wow!), and giant mecha robos who have close to 1000 hit points. Oh woops, better not spoil anymore.
In HL: chronicles, there was one new weapon (actually 2), and that made it awesome. So in this game, there are more than 10 new weapons, so this game is logically more than 10 times more awesome. If you find fault with this logic, than you are perfectly sane. It's called opinion.
I played the robotech one for goldsource.. it looked great i wish they had finished it. Same for a StarWars test mod found also on planet phillip(i'm assuming there is where you found these..)