Is there other apps, apart from Wireshark, which can help view the LAN connections as a whole (e.g. a map), like which computers are connected, who is downloading/uploading etc?
Preferably apps to install on Windows...

Checkout Solarwinds, they have some great tools and the LANsurveyor is a great tool for mapping your topology. Their stuff is a little pricey for what it is but if you want something for personal use they have lots of demos that are fairly unrestricted.

LANSurveyor doesn't show any traffic, but you will be hard pressed to find a simple install or quick tool that will give you the kind of details you want.

thanks guys, keeping this thread open just in case get some more apps as well :)