These Stagecast sims have been updated from original Cocoa worlds. Although the new Stagecast interface is visually ugly, it does have some updated features and is a more stable authoring environment.

Links

www.stagecast.com
the main site, latest info and large games library. Can be slow at busy times.

www.ebizgames
well maintained site by Adrian, plus good games collection.

www.sgsdghgs.com