Epic Pen - A windows tool for drawing over your desktop and applications
Krita - Krita is a professional FREE and open source painting program. It is made by artists that want to seaffordable art tools for everyone. Concept art. texture and matte painters, illustrations and comics.
Pointofix - Pointofix unterstützt Sie bei Vorträgen, Schulungen und Präsentationen. Zeichnen Sie direkt auf dem Bildschirm und heben Sie wichtige Inhalte hervor. Pointofix ist kostenlos.
gInk - An on-screen on-screen annotation software for Windows.
Gromit-MPX - Create annotations by directly drawing on your screen.
Ardesia - Ardesia is an usefull software for use your desktop as a Sketchpad.