Clickteam Fusion

Clickteam Fusion 2.5, or simply Fusion 2.5 is an upgrade from Clickteam featuring a highly optimised runtime and new exporters. It is the successor to Multimedia Fusion 2 and marks an end to the The Games Factory brand. Likewise with Multimedia Fusion 2, there are multiple editions of the software, sharing the same interface but have different runtime agreements and features. (from ClickWiki)