Blackboard Instructor
Blackboard Inc.
Blackboard
Vini_DevHouse
Blackboard Learn
Anthology Inc.
シンプル黒板
razuma
Simple Blackboard
BitDeveloper
Blackboard draw
Innova-Dev
Black Board
PuzzleGame
LiveBoard: Online Whiteboard
LiveBoard
Blackboard by Boogie Board
Kent Displays, Inc.
Google Classroom
Google LLC