swfmill is a free software (GPL v2) command line tool that generates SWF files.

It uses SWFML, an XML dialect closely modeled after the SWF format.

It comes with XSLT capabilities, and a more accessible dialect of SWFML to generate SWF files.

Currently, it imports images (JPEG, PNG), fonts (TrueType), SVG and other SWF files.

It may also place assets on the stage, create movieclips with multiple frames, textfields, among other things.