NTP - No longer active. ntp.ding.net (previously ntp.shorty.com) was a stratum two NTP server I operated. ntp1.ding.net was a private stratum one server. Neither of them are currently operational - there are enough NTP servers online now.
Mailing Lists - No longer active. I used to run various mailing list software and ran a variety of lists for friends. There's no longer a need for this, though I do keep archives of some of these lists online.