Windows only: WinX DVD Author is a shareware application that converts and burns most popular video formats directly to DVD, and it's available for free during the month of October.
Specifically, WinX DVD Author supports loads of video formats from the common to the more obscure, including AVI, ASF, WMV, MPEG, MP4, MOV, RM, RMVB, XviD, DivX, H.264, OGG, QT, FLV and more. The app supports customising your own DVD title and chapter menus with background images, music, title text, and more, supports trimming videos, and can burn to both 16:9 HD widescreen or 4:3 standard def.
We've already featured a couple of different tools that will allow you to burn nearly any video file to a playable DVD, but WinX DVD Author seems like a great tool to add to that list.
WinX DVD Author would normally set you back $US30 but is a free download during October, Windows only. (It even supports Windows 7 32- and 64-bit).