Wonderfl is free online editor and compiler of AS3 code. The site incorporates a basic but functional development environment for users to write/paste their own programs or to edit (“fork”) code submissions of others. Although AS3 apps can already be created without paying for Flash or Flex Builder (a free Flex compiler is available from Adobe), the site offers a very useful environment for quickly testing ideas and finding code examples.
Some extra AS3 libraries are already included on the system and extra ones can be requested or submitted. I requested ModestMaps, Umap and Google Maps for Flash a few weeks back which were added within a few days and I’ve now got around to uploading my FlickrShapefiles example. You can find it here.