This is another thread to list 31 (!!!) of the interesting related things people mentioned in the replies:
statebox.org/what-is/
Stateboxers that popped up in the thread that you might want to follow: @wires_wires @fabgenovese @marcoshuttle
/ht @debasishg
brendanfong.com/7sketches.html
/ht @mostlysafe @channingwalton @James_R_Holmes
/ht @whyevernotso
/ht @nassersala
/ht @schakalsynthetc
/ht @scataco
/ht @leifbattermann
The very same Ralf offers a link to his free book on the topic: leanpub.com/messaging_as_a…
/ht @joemcmahon
/ht @WolfWings