- Haxe/Flash supports embedding .swf libraries : http://haxe.org/manual/swc
- NME/C++ (Android, iOS, ...) has partial support for .swf libraries : http://www.joshuagranick.com/blog/2012/02/08/quick-notes-on-...
- NME/HTML5 doesn't seem to support .swf right now, but I think it's being worked out.
Then you have third party tools such as Flump or Flambe to help you: https://github.com/threerings/flump https://github.com/aduros/flambe