Is there an offline mediawiki editor (for wikisource.org) that fulfills following requirements:
- cross-platform (Linux/Windows).
- capable to work offline most of the time and upload(sync) once there is a connection to Internet.
- not WYSIWG, but with a GUI.
I was working on a java desktop client for Wikisource a couple of years ago, but it never got far. I'll see if I can dig up the code, and add something to enws.
One other possibility would be working with a DjVu editor, and correcting the text layer in a DjVu file before uploading it to Wikisource. Of course, it'd no longer match exactly what's in the DjVu, but that mightn't matter.