UnrealIRCd Forums

A simple module to list all users not connected over SSL/TLS. Just run /PUSERS or /PLAINUSERS to get a nice lil' list. ;] It attempts to cram as many nicks on one line as it can, to avoid spamming you. Only opers can use it obviously. =]

Grab it here

EDIT: As Syzop pointed out below, you can also use the WHO command. Although that shows you a whole bunch of info alongside nicknames, which might be a little much. So yeah, pick one. =]

May be worth mentioning that "/WHO -m z" and "/WHO +m z" can also be used to list non-SSL and SSL users respectively.