Wireless Network Watcher - scans your wireless network and displays the list of all computers and devices that are currently connected to your network.
Toggl - Toggl is an online time tracking tool. It features 1-click time tracking and helps you see where your time goes. Free and paid versions are available.
Nmap - Nmap Free Security Scanner, Port Scanner, & Network Exploration Tool. Download open source software for Linux, Windows, UNIX, FreeBSD, etc.
Harvest - Simple time tracking, fast online invoicing, and powerful reporting software. Simplify employee timesheets and billing. Get started for free.
Angry IP Scanner - Open-source and cross-platform network scanner designed to be fast and simple to use
RescueTime - Time management software that shows you how you spend your time & provides tools to help you be more productive.