Gliffy

httpss://www.gliffy.com/

mxgraph

httpss://www.draw.io/  和 httpss://www.jgraph.com/index.html

DrawAnywhere

httpss://www.drawanywhere.com/

FunnyDraw

httpss://point.mathfan.com/Flash/FunnyDraw/FunnyDraw.swf

Pixlr

httpss://pixlr.com/editor/?loc=zh-cn

google doc

中的 insert drawing

httpsss://docs.google.com/document