Bind IP Changer is for people who run servers behind a dynamic IP address, but have a statically assigned DNS record. It checks to see if the host's IP address has changed, and it emails a notification of the new (and old) IP address to a user-defined email address. It also updates a specified DNS record when the IP address changes.
Appkonference is a high performance voice/video conferencing system for Asterisk. It is a fork of appconference, and it focuses on reliability and scalability. Appkonference has been tested on both Asterisk 1.4 and 1.6.X. Both Asterisk installations supported more than 1200 participants at a time.
Beer Watch allows you to place a temperature probe in your beer wort and perform an action if your wort temperature falls below a certain value, like click a relay on to turn heat on. It was developed using the GPIO from the Raspberry Pi. The install file includes pictures and descriptions to complete the wiring (AC and DC).