Review on NetSim by Ryan Turner

It gives you ability to create different types of networks with ease as well as being able to simulate them in order to find out if they are stable or not! You can run simulations quickly without wasting time building individual topologies up yourself (it's very easy).

The graphical user interface could be better - some screens/graphs may become unreadable when zoomed too much so it makes viewing graphs rather difficult at times. I mainly use this product because we had no option available locally that was good enough nor did our university have access online which would require us purchasing expensive licences elsewhere. But using an open-source tool has made creating complex models quicker than just writing code by hand ourselves; plus there were also other benefits such as having full control over everything including security configuration etc., making sure nothing gets hacked into accidentally during testing / implementation phases before deploying live environments!