I use Aiseesoft Total Media Converter Platinum, that I scored for free at giveawayoftheday.com. This site gives away free software, different each day, and they rotate through some nice video rippers at least monthly, so keep your eye on the site if Handbrake isn't a good solution for you.
I use DVD Catalyst 4 (Home of DVD Catalyst 4). It's not free (there is a free trial though) but it's well supported and allows you to optimize for the device you own, including the GN 10.1. Worth the the $9.95 IMO.