iSSH – SSH / VNC Console
The UI allows you to create many connections and file them by system/client/etc, so they are easy to find. You can create connections via SSH, Telnet, and VNC. The connections list has a nice “online/offline” status for every server at a glance. Performance is excellent over any type of connection. The actual terminal UI is fantastic.
Nice Trace – traceroute
Gives you a constantly-updating live traceroute to your host. It’s easy to see where there are delays, either immediately or over time. When left running for a few minutes, it paints a very useful picture of the connectivity.
Excellent Windows Terminal Server (RDP, RDC) client. Also does VNC very well, and uses Bonjour for auto-discovery. Performance is excellent and the UI is very good.
Just a nice quick ping utility that remembers your hosts and lets you choose them for quick testing. Nothing fancy.
Speedtest.net Speed Test
Simple, fast, reliable speed test. Of all of them, this gives me the most consistent and accurate results.
Yeah, so a super-admin can do binary math in his head in a few seconds. For the rest of us, this is a great subnet calculator.
WiFiFoFum (WiFi Scanner)
Great tool for testing wireless networks you’re deploying or troubleshooting. Lots of good info, fast refresh rate.
Evernote – capture notes and sync across all devices. Stay organized.
Keep track of the details for each of the networks you manage. Sync online and between the iPhone and iPad. Share with others.
This app goes along with the WiSnap or WiFly serial to wi-fi adapters. This allows router/switch admin via a serial port using either an iPad or an iPhone. You simply telnet to the IP of the adapter and you have a regular serial connection. Works great, and the device is very small and low-powered.