BtBatStat is a simple OS X app that shows the battery status of your Apple bluetooth mouse and keyboard in the menu bar. It supports the Apple BT keyboard, Apple Mighty Mouse, Apple Magic Mouse, and the Apple Magic Trackpad.
Harald Scan is a Bluetooth discovery scanner. It determines Major and Minor device classes according to the Bluetooth SIG specification and attempts to resolve a device's MAC address.
A command history suggestion box for BASH.
A basic image difference viewer.