Wraith is an open source IRC bot written in C++. It has been in development since late 2003. It is based on Eggdrop 1.6.12 but has since evolved into something much different at its core.
This software shall enable users to send / receive denyable messages: Nobody can prove a message is from / for a specific user.
Messages can be made private (by using password) or are public.
All messages have an expiration time/date / event