Gitea - A painless self-hosted Git service
Clever - syncing between education applications for K-12 schools
GitLab - Create, review and deploy code together with GitLab open source git repo management software | GitLab
PowerSchool - PowerSchool provides a K-12 education technology platform for operations, classroom, student growth, and family engagement.
GitBucket - GitBucket is the easily installable open-source GitHub clone written with Scala.
Claroline - Claroline is a collaborative eLearning and eWorking platform.