Markdown Markdown-plus http://mdp.tylingsoft.com/ stackedit http://stackedit.io  GitHub(http://github.com/benweet/stackedit) stackedit beta http://stackedit-beta.herokuapp.com/ UML/Chart flowchart.js http://adrai.github.io/flowchart.js/ js-sequence-diagrams http://bramp.github.io/js-sequence-diagrams/ CodeUml http://www.codeuml.com/ YUml http://yuml.me draw.io (可视化编辑) http://draw.io Gliffy (可视化编辑) http://www.gliffy.com LucidChart http://www.lucidchart.com IDE CodeBox http://www.codebox.io ACE http://ace.c9.io Cloud9 http://c9.io