TMPGEnc DVD Author 3 now includes both DVD authoring and DivX authoring. DivX authoring allows DivX files to have DVD like features (menus, subtitles, multiple audio), while still only using a single file (.divx). These kind of DivX files (called "DivX Ultra"), are even playable on DivX-Ultra certified DVD players, complete with all the advanced features.
DivX.com also releases a software called DivX Author, which is basically TDA without the DVD authoring part.
