kdiff3
Beyond Compare
WinMerge
Meld
Araxis Merge
DiffMerge
P4Merge
Devart Code Compare
PingInfoView
Ping Meter Gadget
Open Nettest
Fping (open source)
Multiping
OpenSpeedTest
PingDoctor
NetCrunch Tools
kdiff3
PingInfoViewBeyond Compare - Beyond Compare allows you to compare files and folders.
Ping Meter Gadget - Customizable, graphical, semi-transparent ping (latency) meter.
WinMerge - WinMerge is an open source differencing and merging tool for Windows.
Open Nettest - Open Nettest is a platform for collecting, processing and visualizing data related QoS and QoE.
Meld - What is Meld? Meld is a visual diff and merge tool targeted at developers.
Fping (open source) - fping is a program to send ICMP echo probes to network hosts, similar to ping, but much better performing when pinging multiple hosts.