Ok,so i want to play some mods that i haven't played, so i want to hear your favorite mods, so i can play them i f i haven't so far. Plus,let this be a vote for us to find the best mod ever
Poke 646 (and the Vendetta mini-expansion thing) is a very good HL1 mod. As is Peaces Like Us and Azure Sheep, and several others I've forgotten the name of.
And if you're feeling hardcore, check out Half Quake: Amen and Half Quake: Sunrise
They Hunger series
Hazardous Course 2
Focal Point
DAV's work (Azure Sheep, Point of View and his map packs)
Heart of Evil
Brendon Chung's work (Bugstompers, Bootleg Squadrog, 1986, The Puppy Years)
Todesangst series
Hour Glass
Half-Life 2
Underhell
Research and Development
Mission Improbable
Technically they distributed it rather than make it, great series though!
There are so many from that era I remember.. USS Darkstar, Azure Sheep and Redemption are those that I can still name. I haven't played many Half-Life 2 mods, but I do remember Mistake of Pythagoras for its creepy brush-based monsters and alphabet rain.