Here’s an interesting mod:
Tarzan: Source. You play as a character who swings from tree to tree. You automatically stick to lians and ropes, and press space to let go of them. You are hunted by human villains and various people.
Melee attack only. A few animals under your command make it interesting.
Online only. Tarzan is like the hidden, only with a few other advantages/disadvantages.
Other gamemodes on the mod includes deathmatch (Tarzan v. Tarzan or villains v. villains), king of the hill and capture the flag.