[fr0sty]

http://HamStudy.org is a free (and ad free) site that lets you study the amateur radio question pools.

The developer also built ExamTools which many groups use to administer remote license exams. You can find sessions here: http://hamstudy.org/sessions

[gravypod]

If you want something self hosted I also wrote this: https://github.com/gravypod/ButcherSchool

The scripts there should still work for the exams.