Kevin, development has completely stopped on Sigil. The main developer works full time writing code and writing and supporting it took too much time. It is written if I recall in C++ which is used primarily by professional programmers who are already working full time. There are a lot of people who can pick up Python, which is the language of Calibre, but the C languages are a different story.
As useful as it is, its user base, professional e book producers and serious amateurs is fairly small, so a financial reward is elusive.
Calibre has had an editor added to it, but it is not quite the same thing, making no attempt at WYSIWYG. You can write directly in Sigil, but that is not possible in the calibre editor. Sigil strives for valid code all the time, and enforces its own structure toward that end. Calibre lets you bring in any sort of junk html and play with it to your hearts content and only enforces valid code if you check book, which you must do repeatedly to get every last error.
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