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I'm planning to open source most of the parsing/formatting/API code. Making everything open source would not make it sustainable. Sorry.

Well, I would say with all the competition out there is this area ... open sourcing it can actually help you sustain it

1. If it becomes really popular, you can make video tutorials and sell ads on your site 2. You can consider making it donation ware

There really isn't much options to build revenue streams around a FOSS text editor Its a tuff area