The Network Visualisation Tool (spelling should have been Visualization :D) was a very helpful item in AE2 Stuff for 1.12.

It was really easy to visually see where all your channels were going and if something wasn't working, it would render a red line/box, etc. and help troubleshoot a network that, for example, had too many channels going somewhere (like when I've forgotten to put an anchor and there was unintentional link(s)).

It helped me when I was teaching friends AE2 and eventually they were able to troubleshoot themselves instead of having extra eyes go over every single connection to figure out where things went wrong.

This has saved me a TON of time in the past.

AE2Stuff Git References

Example of how it looks in-game-