Dear colleagues, I would like to present to you the conference tool "Rainbow". I am very satisfied with using it. (Lecture blocks, 4 hours, 5 participants; used functions: Screen sharing, voice over IP, muting/unmuting for both sides usable, text messages) Telekom Austria offers the tool for free for at least 3 months <https://www.a1.net/rainbow4school> MFG Johann Nicolics