Solanum is based on Charybdis, which was based on ircd-ratbox.

Development is led by a group of representatives from Libera Chat
and OFTC:

amdj, Aaron Jones <amdj@libera.chat>
dwfreed, Doug Freed <dwfreed@mtu.edu>
ilbelkyr, Nicole Kleinhoff <ilbelkyr@libera.chat>
mcintosh, Richie McIntosh <richiemcintosh@gmail.com>
Myon, Christoph Berg <myon@oftc.net>
spb, Stephen Bennet <spb@libera.chat>
tomaw, Tom Wesley <tom@tomaw.net>

The Charybdis team was:

amdj, Aaron Jones <aaronmdjones -at- gmail.com>
Ariadne, Ariadne Conill <ariadne -at- dereferenced.org>
Elizafox, Elizabeth Myers <elizabeth -at- interlinked.me>
jdhore, JD Horelick <jdhore1 -at- gmail.com>
jilles, Jilles Tjoelker <jilles -at- stack.nl>
mr_flea, Keith Buck <mr_flea -at- esper.net>
viatsko, Valerii Iatsko <dwr -at- codingbox.io>

A full list of contributors to Charybdis and its predecessors
is in doc/credits-past.txt.

Visit the Solanum website at: https://solanum.chat/
Visit us on IRC at: irc.libera.chat #solanum
