Half-Life has always amazed me over how many mods have been made for this groundbreaking game, Many of the mods have been single player but some are also multiplayer as well.
I'm not a stranger to Multiplayer in Half-Life or it's sequels, In my time I was playing at lease 5 days a week on severs all around the world.. Now? I rarely have the time to do so but I play only if friends are using "New" WON because I find Steam to be a very problematic utility (not to mention, A data hog)
In this countdown, I have went through about 100 Multiplayer mods to decide which 10 are the best of the best and can withstand the test of time, (even though some may not agree about it), This is what I think are the top 10 greatest Half-Life Multiplayer/Co-Op mods.
10:Contra Force
9:Cold Ice
8:Canned Tuna
7:The Battlegrounds
6:Opposing Force:Capture The Flag
5:Sven Co-Op
4:Counter Strike 1.6
3:Hardcore-Life
2:Science And Industry
1:Team Fortress Classic
Yay!