Currently, the only adventure mods there are in the Technic Launcher are really Hexxit and Hack Slash Mine.
Hack Slash Mine was discontinued and could have been very enjoyable if it wasn't. There are quite a number of enjoyable systems there that should be fleshed out.
Hexxit is really just dull, easy, and lacks depth. The more noticable portions of it are the Hexxit Armors, Twilight Forest, and the dungeons around the world. The Hexxit Armor was really quite easy to acquire if you knew where to find it and granted you abilities that make much of the game very easy. The Twilight Forest