Adobe still offers Animate as part of Creative Cloud and you can use that to build AS3 movies. If you want AS2 you have to go back to at least CS6, though CS5.5

Adobe still offers Animate as part of Creative Cloud and you can use that to build AS3 movies. If you want AS2 you have to go back to at least CS6, though CS5.5 is preferred as it has significantly wider FLA support. (Don't ask me why that was removed in CS6.) If you don't like the idea of paying Adobe money you can use Apache Flex, which is the FOSS version of Adobe's toolchain. That's a command line compiler tool, of course, and it only compiles AS3 files, so you'll still need to author and link graphics separately, and for vector art stuff you'd probably need to find a way to convert SVGs to SWFs, embed them in your main SWF thru some weird class declaration magic in Flex, and deal with the subtle masking problems that would cause.