A simple module to list all users not connected over SSL/TLS. Just run
/PLAINUSERS to get a nice lil' list. ;] It attempts to cram as many nicks on one line as it can, to avoid spamming the fuck out of you. Only opers can use it obviously. =]
You can also achieve the same result with the already existing
/WHO command but the specific flags you need might be a little hard/confusing to remember (even more so now that
WHOX is a thing).