Steam's Turn-Based RPG Fest has discounts and demos you can download then play, in that order
"Turn-based" games are, as we know, all derived from Turn, the strategy game about a dog digging for coins released for the BBC Micro in 1987. Prior to this, all actions in games simply took place simultaenously, as fast as the player or players could make them.
Fast forward to today and many games are now "turn-based", from Tactics Ogre Reborn to Age Of Wonders 4 to chess. In celebration of their orderliness, Steam is currently running a turn-based RPG fest featuring discounts and demos for "turn-based games where you grow stronger with every battle".