This is an Excel based gradebook with calculations already programmed. No experience with Excel is necessary, but if you know Excel then you can easily modify this to suit your needs.
Set up for 30 students, with a Test-Quiz-Homework based grade, all you need to do is enter the percentage that T, Q, and H, count for, type in the students' grades, and their average is already calculated for you. Students failing and at risk of failing have their averages turn red and yellow respectively so you can see how your class is doing.
First tab in file is Notes.