Miro, OpenBoard Whiteboard, DrawPile, Whiteboard Team, Coccinella, NoteBookCast, Conceptboard, Scribblar, IDroo, CoSketch, Aggie.io, Deekit, Twiddla, Ideaflip, Kinopio, Limnu, Scriblink, WrittenUp, skrbl, drawonthe.net, PrimaryPaint, Board800 are some alternatives to Groupboard.