helpmebot.org.uk
This command configures the channel welcomer. Any user who has a hostmask on the list (but not on the ignore list) will be greeted with the message at Messages:WelcomeMessage/channel (for example, Message:WelcomeMessage/wikipedia-en-help on their entry to the channel. As a fallback, it will use Message:WelcomeMessage.
If there are no hostmasks in the list to be welcomed, then nobody will be welcomed.