This daemon handles as much of the weird signal-specific stuff and exposes an easier to use API. It handles things like encrypting and decrypting messages, generating and storing keys, syncing with linked devices and a bunch of others.

signald doesn't really "trigger actions" or anything, but it would be pretty easy to write something that does using it.

There is a CLI client. Notifications/subscriptions may not be available. I think someone mentioned later in the thread that signald is a fork of signal-cli.

https://github.com/AsamK/signal-cli

Right but you can already communicate with the official signal server using a socket.

a pidgin (libpurple) plugin actually exists already: https://github.com/hoehermann/libpurple-signald

I'd like to improve the website to better showcase the clients