Is there a native Linux application that facilitates/enforces semantically marked-up text in a common format (HTML, Markdown, etc.) with instant feedback of how it looks with "pretty" formatting?
I'm looking for something like (the rather brilliant) browser-based WMD, but with the following additional features:
- native application - can use it offline without running a web browser, take advantage of OS integration, input would not be in a fixed-size box.
- single screen - can edit the "pretty" display directly (see the WMD link for an example of editable text and "pretty" display side-by-side).