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Outline
The fastest knowledge base for growing teams. Beautiful, realtime collaborative, feature packed, and markdown compatible.
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SurveyJS
Open-Source JSON Form Builder to Create Dynamic Forms Right in Your App. With SurveyJS form UI libraries, you can build and style forms in a fully-integrated drag & drop form builder, render them in your JS app, and store form submission data in any backend, inc. PHP, ASP.NET Core, and Node.js.
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Joplin
Joplin - the secure note taking and to-do app with synchronisation capabilities for Windows, macOS, Linux, Android and iOS.
I use Bookstack https://www.bookstackapp.com as well. I really like it. I have installed it for our corporation and most people seem to be pretty happy with it. The UI is pretty nice but it is not as feature rich as Confluence especially when it comes to roles and permissions (but it is getting better).
The correct answer is Tiddlywiki.
Can't give too much advice in regards to Confluence, but in regards to BookStack import the REST API is probably the best best. API docs can be seen on our demo instance here. API usage examples, and community projects/scripts, can be found here if it helps. You might be able to find existing confluence to bookstack scripts. Came across this in a search but not sure how feature complete or up-to-date it is.
Can't give too much advice in regards to Confluence, but in regards to BookStack import the REST API is probably the best best. API docs can be seen on our demo instance here. API usage examples, and community projects/scripts, can be found here if it helps. You might be able to find existing confluence to bookstack scripts. Came across this in a search but not sure how feature complete or up-to-date it is.