Is there any opensource HTML editor like stackoverflow? [closed]

Question

I want to setup my technology blog，and I want to install one good html editor for my blog site, which is suitable for codes. I found that the editor of stackoverflow is pretty good, I want to know is there any open source editor like this?

Answer 1

StackOverflow uses WMD.

2014 update: WMD is marked as obsolete.

Answer 2

1. WMD Editor Reverse Engineered
2. https://meta.stackexchange.com/questions/36179/whats-the-deal-with-the-wmd-editor