This week, we feature Castles & Crusades. This RPG dates back to the 3.0 D&D boom when dozens of companies brought out all sorts of RPG supplements for D&D under the OGL. Castles & Crusades is one of the very few companies (Paizo's Pathfinder RPG is another) to still survive from that era, the tagline being "Third edition rules, 1st edition feel." Troll Lord Games has always focused on recreating the style of adventures from the early days of D&D and AD&D, before there was a heavy emphasis on plot and campaign and adventures stood on their own, rather than linking together.
While characters have skills, character class is a major focus of C&C, much as it was in early AD&D and your character class defines what your character can do. If you like D&D 3.0 (or 3.5) or the play of Pathfinder, but Pathfinder has gotten too complex and materials for D&D 3.0 and 3.5 too hard to find (it is out of print after all), take a look at Castles and Crusades.