Lightspark is a free, opensource SWF (Flash) player. It supports OpenGL-based rendering and LLVM-based ActionScript execution. It supports most of ActionScript 3.0 and has a Mozilla-compatible plug-in. It uses OpenGL shaders (GLSL). It is free software released under the terms of the GNU LGPL version 3. Lightspark is compatible with H.264 Flash videos on YouTube.

It supports Mozilla Firefox and Google Chrome.

Website: License: LGPLv3