Flare (Free Libre Action Roleplaying Engine) is a simple game engine built to handle a very specific kind of game: single-player 2D action RPGs. Flare is not a reimplementation of an existing game or engine. It is a tribute to and exploration of the action RPG genre.
Flare is currently in development. Though it is meant to be a game engine which can be used to create more games, it is turning out to be a full game in itself. Check out gameplay video: