ShaPlus Bandwidth Meter runs in the system tray and displays the current, daily and monthly bandwidth usage for selected network adapters. This will be useful for people with limited bandwidth/month internet connection.
Network Asset Tracker allows you to make up a network inventory without installation of software on the user's PCs. This program allows you to get information about operational systems, service packs, hotfixes, hardware, installed software.
AgataSoft PingMaster Pro is a router monitor which you can use for detecting bottle-necks in your network. It will help you to quickly identify any issues with your networking devices by constantly monitoring them in the background.