this looks like a cleaner, responsive version of Google Sites. Google Sites doesn't work very well on mobile; this is responsive and they're also working on dedicated mobile apps. It also has Git and markdown functionality. Example of a wiki in the "related links" section.
Admin demo account: demo@example.com / Pass: torchpad
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Great looking product! I'm constantly in search-mode for a great "thought organizer". I've tried everything from wikis to outlining tools to mind maps and I've yet to find anything that sticks for more than a few weeks.
Hustle X