on the mac: DVD Studio Pro

on the mac:
DVD Studio Pro

on the PC:
Adobe Systems – Encore DVD 1.5
Sonic Solutions – DVDit 5
Sonic Solutions – ReelDVD 3
Ulead Systems – DVD Workshop Express
Ulead Systems – Ulead DVD Workshop 2

This is a good link to get started with…
http://www.manifest-tech.com/links/dvd_sw_gallery_pro.htm#Professional%20DVD%20Authoring%20Tools

I use DVD Architecht which comes bundled with Sony’s Vegas. Can’t buy it on it’s own.