Re-LogicAdditional info: Their most famous game - Terraria was developed by Re-Logic, with development starting in January 2011 and is built on the Microsoft XNA framework. The game was released on May 16, 2011. Re-Logic is composed of Andrew Spinks, who designed and programmed the game, and Finn Bryce, who along with Spinks did the graphic design for the game.
List of programs by Re-Logic
Developer support information