Platen Markdown WordPress Editor chrome web app developed by AlexTatiyants , it’s a google chrome app that work on windows,Linux and mac .
Markdown is a text-to-HTML conversion tool for web writers. Markdown allows you to write using an easy-to-read, easy-to-write plain text format, then convert it to structurally valid XHTML (or HTML).
Markdown is a lightweight markup language, originally created by John Gruber with substantial contributions from Aaron Swartz, allowing people “to write using an easy-to-read, easy-to-write plain text format, then convert it to structurally valid XHTML (or HTML)”.
Markdown is used by some of the worlds tops site like github for creating readme and stackoverflow
Returning back to platen
platen is awesome wordpress editor its works best with offline editing and posting ( i am writing this post offline using platen )
take a look at platen i am sure if you ever used markdown you are gonna love this is awesome editor
see more about how to use and more about platen
See Some awesome cheatsheets