Just released by Adam ‘Atomic‘ Saltsman for the benefit of indie devs everywhere: the Flixel engine, an open-source, fully featured, newly updated version of the Flash AS3 library Saltsman used for both his original web hit Gravity Hook, and the most recent Offworld-featured Fathom.

Flixel, which is meant to forgo the Flash IDE entirely, contains a number of improvements to how Flash handles 2D games, with support for spritesheets, baked in basic physics and particle effects, and the procedural map-generation code he used for the deep fathoms of Fathom.

You can dig through Flixel’s documentation via the official home site, and try Mode (above), the included de-Mo (see what he did there?) game that demonstrates the engine’s built-in features.

Flixel [AdamAtomic]