MTASC is the first ActionScript 2 Open Source free compiler.
Right now it’s a command line compiler which get .as files as input and will generate .swf files as output. This means it can be easily integrated into any editor which can run command line tools (such as sepy).
It seems MTASC is more and more quickly than the internal flash compiler:
MTASC is based on the best compiler technology available (namely the OCaml programming language) and thus provide a great speed improvement over MMC (compile around 100 classes in less than 5 seconds).
Since the source code is made more concise by using good technology, it is more easy to maintain and implement robust and proven typing algorithms. The feedback we get from Open Source community help us fixes the bug quickly.
It’s made using OCaml as programming language.
The mailing list is available at this link: http://lists.motion-twin.com/mailman/listinfo/mtasc
For examples, download and bugs refer to the linked MTASC page.