qtmib is a simple and open source MIB browser for Linux based on QT. It supports SNMP v1 and v2c, network discovery, a lot of built-in MIBs and you can add your private MIB also (under ~/.config/qtmib/mibs).
To install it, simply go ...
Some days ago I tried to connect my GNS3 devices to the outside with the cloud icon (note that you have to launch GN3 with root rights), it works well but I noticed that I couldn't reach my local ...
I just want to show you a useful tool for your networking calc called sipcalc, to install it (under debian based, but it should also exists in your favorite distro) :
sudo aptitude install sipcalc
Some examples, here in IPv4 format :
~ sipcalc ...