ASconverter is an Ant task and some scripts to aid porting ActionScript2 projects to ActionScript3. It is very helpful when you need to keep developing the main product in AS2 and want to port it to AS3 at the same time the code fork seems too difficult. Then why not try it now?
ANT is an excellent tool for automating software processes. It is like MAKE but it uses the Java language. If you are using Flex SDK not the Flex Builder, it must need to repeat the same command to complete the compile and package work. Then ANT could help you to do so. Following is the article introduce how to use ANT to compile your SWC( an example showed ). You could have a try according the example.