Because its not available anymore, and its just mods, someone uploaded the entirety Half-Life : Add-ons to ModDB.
lots and lots of random crap from modders for HL1 - http://www.moddb.com/games/half-life/addons/half-life-add-ons-rare-cd
haven’t looked at it yet, but wow. take a look at what it advertises.
-Freeman’s Revenge Road of Destiny
-TFC with 25 extra maps
Along with 12 more SP mods. It also contains lots of other random stuff like player models/skins, 180 deathmatch maps apperantly, config files, and editors, wallpapers, desktop themes, Half-Life Font, Prefabs, and a Half-Life WinAmp Skin?
This is not an advertisement.