Is there a self-hosted version?
I provide a self-hosted version of Remarkbox with a yearly license fee (priced for business to business).
And is the source code available publicly?
The complete source code was not made publicly available.
That said, I'm a strong advocate of open source. Many of the libraries used to create Remarbox are open source, as well as the operating systems used to run the service. I have personally open sourced some of the custom components of Remarkbox with liberal licenses (sometimes even public domain).
At this time I'm trying to make a company out of Remarkbox so that I can eventually run it full time. To accomplish this goal I have decided against providing the complete source code in the open.
That said I am looking for engineers who know Python and want to help with the internals, if this is you, please reach out and I'll arrange for access to the code base to assist with code review or pull requests.
Have you looked into the Fair Source License? Seems like a good fit here. https://fair.io
The source code is available privately to Python developers, if this is you go here: https://meta.remarkbox.com/12d31ca6-680c-11eb-8f71-040140774501/calling-for-python-engineers-who-want-to-hack-on-remarkbox-code-base
If you want to hear more, I cut a video about it over my lunch break: https://youtu.be/RD0FZ-ddido