I also use online certification testing software for the students in my class. I teach Computer Repair and Maintenance. My students use Certiport Online Testing to study for and take their certification exam at the end of the year.This is an effective way to measure student comprehension.
Another excellent tool is Camstasia. I have used this video creation/editing software sporadically in the past but plan to to use it in a "Student Teacher" project the second semester next year. Students will create a lesson plan, a comprehension assignment and an instruction video of the topic they will be teaching to the class. they will then edit and post their video on a YouTube channel.