“The universal IRC client”
Starting from OpenBSD version 6.7 Swirc is officially available via pkg_add for multiple architectures.
Browse the archive of Swirc releases for OpenBSD
to see if it's available for your architecture.
I currently don't have the resources to build it for all architectures.
# pkg_add -v -D unsigned https://www.nifty-networks.net/swirc/releases/OpenBSD/6.6/amd64/swirc