I'm happy to announce that my barebones ActivityPub server, implemented in Node.js/Express, is now open source! I intend for it to be a reference implementation for developers who are adding ActivityPub to their own services, but also it is an application server that you can build on if you want.
In other words, t's a few hundred lines of code that lets you create Mastodon-compatible accounts that can accept follow requests and post stuff to their followers.
I actually built a little toy service (that I will also eventually open source) which converts any RSS feed to an ActivityPub actor that you can subscribe to in Mastodon (or any other AP-compatible client).
Play with it if you like! It is SUPER rough and most feeds end up horribly rendered in Mastodon but it's still kinda cool to see it work: https://bots.tinysubversions.com/convert/
@darius it didn't work. :( It only took me to /u/test instead of the user page for the bot I tried making, and when I manually changed the URL, it said no bot was found.
@darius also it appears to have changed the test profile to the RSS feed I chose, or we both had the same weird idea for what feed to try... (your Mastodon profile's own RSS feed...)
Private instance for puzzle author David Millar and a few homies.