- https://inkscape.org/zh/
- https://github.com/sprang/Inkpad
- http://webchemy.org/
- http://kleki.com/
- http://www.wacom.com/zh-cn/products/stylus/intuos-creative-stylus-2
- http://www.bohemiancoding.com/sketch/
utensil commented at 2015-04-23 07:30:
Prefer Inkscape and learning.