He has shared part of his toolkit, namely the exporting and syncing of the Bear notes, and “link-janitor” for the backlinks [1]. Although I wouldn’t recommend it in general - it’s a brittle prototype. And right now there are better tools out there (linked above) many of which appeared in the last few months.

[1] https://www.reddit.com/r/bearapp/comments/enbk65/sharing_a_s...