SandCastle
SandCastle is an ActionScript library built by The Yellow Thorn (www.theyellowthorn.com) on the Away3D framework to support higher-quality 16-bit terrain generation and manipulation. It accompanies the SandCastle program (www.theyellowthorn.com/sandcastle/get) which is designed to create and preview 3D worlds for Flash and AIR projects.
Live Flash Demo: http://www.theyellowthorn.com/sandcastle/demo
Short-list Features video: https://www.youtube.com/watch?v=pw7CxRP4_O8
TWITTER: https://twitter.com/TheYellowThorn
FACEBOOK: https://www.facebook.com/sandcastleapp