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2muchvid's list of Single Player Half Life mods:
Moddb.com
A long list with mods and maps
Pcosmos.ca
Mods and maps: Andrej.mernik.eu
Half Life mods: Moddb.com
Half-Life maps: Moddb.com
GmanMaster's list of Dead Half Life mods Moddb.com
Blue Shift:
Moddb.com
Opposing Force:
Moddb.com
My favourite Mods:
Heart of Evil, HL Invasion, they hunger, the trap, Visitors, Radiation Alert Episode one, Infestation, Residual Point, Timeline 1 – 3, ETC 1 & 2, USS Darkstar, Edge of Darkness, Escape 1 & 2 (dmcia.de), Brave Brain, Hard 2, Cry of Fear, Cleaners Adventures, Hidden Evil, The long night, Instinct, Operation Nova, Hard 2, Escape from the Darkness, Operation Firesweep, Freemans Revenge
Kudos for all the HL Mod uploads ^^