Widget to start a countdown to power off phone. To power off root is required. The shutdown is done in a rather brute way as Android lacks support for nice power off from ordinary applications. The timer to power off can be started when charger is disconnected from phone.

Please be aware that your phone might initially require you to acknowledge root privileges both when saving HaltTimer settings and when HaltTimer shuts the phone down.

GPL license, source at http://halttimer.sourceforge.net