Elflight Engine is a high-performance 3D scene-graph based games engine designed for the Web. It supports games in a web browser, a window or full-screen. It can download game resources when needed in the background over the Net to allow games to start up quickly when first played. Java 1.5+ is required and the engine is OpenGL-based.

It is particularly useful for the development of MMOs and virtual worlds.

Collada is supported for importing assets into the engine.

The Elflight Engine is used in Everplanes , a game of exploration, building and survival for Mac OS X, Windows and Linux.