1)   Free XviD AVI 2 Zen Vision m Pro 1.9.0
From the name: Free XviD AVI 2 Zen Vision m Pro, we know that its focused aim is to convert XviD AVI to Zen Vision m and it's free, totally free. It can convert superfast, however, you do not need to worry about the output quality.

 2)   Free XviD AVI 2 Zen Vision m Lite 1.5.4
Free XviD AVI 2 Zen Vision m Lite is an easy to use and professional conversion program which allows you to convert XviD AVI to Zen Vision m format totally free. The conversion speed is fast and output quality is great.