DC++ - DC++ developed by Jacek Sieka.
Clever - syncing between education applications for K-12 schools
EiskaltDC++ - EiskaltDC++ is a program for UNIX-like systems that uses the Direct Connect and ADC protocol.
PowerSchool - PowerSchool provides a K-12 education technology platform for operations, classroom, student growth, and family engagement.
AirDC++ - AirDC++ is an easy way to share files between users.
Claroline - Claroline is a collaborative eLearning and eWorking platform.