Xtags for Mac

From Em Software:

Xtags is a powerful import and export text filter supporting the full Quark XPress Tags language plus its own extended Xtags tags, for tremendous document-building and extracting power in both QuarkXPress and Adobe InDesign. With Xtags, you can build any text content with full styling (the same as XPress Tags), anchor and fill picture and text boxes, build and fill unanchored boxes, size picture contents to containing boxes, size boxes to content (text or picture) in various flexible ways, translate text and tags on input, use macros to reduce typing, apply master pages and spreads, and more. For output, Xtags will save the contents of any text story, including anchored text and picture boxes, and will also save the structure and content of any selected text, picture or group boxes.