Flex: Long polling (ie, server push) without BlazeDS?

Apart from using BlazeDS, are there any pre-existing libraries that implement long polling (or server push) in Flex?

Note: I've read I like to implement Flex to Server comet / long polling for games, but he's only asking if it's possible to impleme开发者_JAVA技巧nt… Not if implementations exist.

It looks like one possible solution is AmFast, an AMF/remoting implementation in Python: http://code.google.com/p/amfast/

GraniteDS can do this.

A little different, and not really the projects focus, but Red5 can also do this.