Everyone,
I was inspired from the talks at the RIOT summit by Jaime Jiménez and Christian Amsüss to organize a top-level link on the wiki about standards based application development [1]. It will provide new users with an entry point to our implementations and packages. The CoAP page goes into more detail on the current state of nanocoap and gcoap.
Let me know if you can think of a better place for it, and of course update it with anything I've missed. My goal is to fill in more of the boxes above layer 4 from Christian's talk [2]. I am happy to be the page maintainer.
Ken
[1] https://github.com/RIOT-OS/RIOT/wiki/Standards-Based-Application-Development [2] http://christian.amsuess.com/presentations/2018/summit-coap/slides.pdf#page=17