Picking out a few from this list should get you started and keep you busy.
Monster Hunter Freedom Unite - the Legendary Action Adventure RPG in all its glory
Out There - adventure
Appointment With FEAR - RPG adventure game book
Oddworld Strangers Wrath - action adventure
Bioshock - the legendary FPS
Skullduggery - platformer adventure hybrid
Shadowrun Dragonfall - RPG sequel to Shadowrun Returns
Hellraid The Escape - adventure
Asdivine Hearts - arguably Kemco's best JRPG title
The Banner Saga - SRPG
Baldur's Gate 2 - RPG
Icewind Dale - RPG
The Dragon Quest Titles - the legendary series from Square Enix that isnt Final Fantasy

Battleheart Legacy - one of the best games on iOS. RPG
Wayward Souls - Touch Arcade's Game of the Year. Realtime(zelda-esque) roguelike RPG.
Tales from the Borderlands - point and click adventure similar to The Walking Dead
The Wolf Among Us - another Telltale adventure title
Game of Thrones - another Telltale title
Lone Wolf - turn-based RPG - gamebook hybrid