What are some alternatives?
HelioHost - Community powered free hosting for everyone.
draw.io - Online diagramming application
Rackspace - More than 100,000 businesses trust Rackspace with their hosting and cloud computing. Get cloud, managed and hybrid hosting all backed by Fanatical Support.
OmniGraffle - OmniGraffle is for creating precise graphics like website wireframes, an electrical system designs, or mapping out software class.
000webhost - Zero cost website hosting with PHP, MySQL, Cpanel & no ads!
SmartDraw - Instead of starting with a blank screen, SmartDraw gives you the exact template you need.