Google Classroom - Learning management tool by Google
Infinite Campus - Access your (or your child's) schedule, grades, assignments and attendance data using the...
GitHub Classroom - Your course assignments on GitHub
YellowFolder - School Resource Management
Peergrade - A student feedback and grading platform
Gradelink - Gradelink is a one-stop-shop system for K-12 schools. You can see grades, attendance, tuition, admissions and communication in one place.