There are many great products and amazing software available. Check back for the "Sisters" review on what they use in their classroom and daily life.
Flubaroo is used in correspondence with Google Forms/Spreadsheets to enable self grading. The result is a report which not only gives a percentage grade, but also highlights questions which have less than 60% of students have correct responses.
A nice feature included is the ability to have scores emailed to the students. Another capability of this script is the ability to create a histogram of results. I am hoping for many updates for this script. My suggestions would be to allow more than 1 point earned per question, and the ability to have more than one response in a text question (example: list the last 3 presidents from newest to oldest). Thank you Flubaroo!