David Boertmann’s 2010 dichotomous key for identifying waxcap fungi (Hygrocybe, Cuphophyllus, Gliophorus, etc.) converted to a simple web interface:
https://waxcaps.com/tools/waxcap_key.html
Boertmann, D. (2010). The genus Hygrocybe, 2nd revised edition. Fungi of Northern Europe, Vol 1. ISBN 9788798358176. Svampetryk: Denmark.