Try these links.

b2evo uses the same xml-rpc protocol as wordpress. Here's an outdated list of remote publishing programs. Blog and Ecto look promising.
https://wordpress.org/support/article/weblog-client/

Here's a b2evo support page for remote publishing aka desktop blogging with sample url info.
https://b2evolution.net/man/desktop-blogging-tools-1

You might need to turn on xml-rpc
https://b2evolution.net/man/xml-rpc

The xml-rcp feature of b2evo is a pro support only thing evidently. Feel free to send me $20 :)