Epic Pen - A windows tool for drawing over your desktop and applications
MacinCloud - MacinCloud is a Mac cloud platform that provides on-demand Mac cloud servers, flexible dev workload infrastructure and comprehensive Mac in the Cloud solutions
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.
XCodeClub.com - Rent your own private Virtual Mac with latest XCode.
PaintTool SAI - Learn to draw in different ways.
VirtualMacOSX.com - vmOSX -- is your affordable, Mac-based home on the web.