Great simple tool. Added it to Security Onion as an easy-to-use graphical interface. Looking at nodal traffic is great and tracking accumulated traffic as well (except it is unclear as to the time frame over which traffic is accumulated). Support is a little thin but I am glad it is still getting some attention.
Etherape is amazing - just open it up in a free wifi area and see what it can do. Thank you to the authors/developers. Beautiful work.
There isn't another tool like etherape. Watching traffic flows via a managed switches monitoring port with etherape gives you a better instantaneous picture of what is happening on your network than anything else. Just use it.