nmon - This systems administrator, tuner, benchmark tool gives you a huge amount of important performance...

iperf - A TCP, UDP, and SCTP network bandwidth measurement tool

iftop - iftop does for network usage what top(1) does for CPU usage.

TamoSoft Throughput Test - TamoSoft Throughput Test is a utility for testing the performance of a wireless or wired network.

vtop - vtop is a graphical command-line tool that uses unicode braille to chart CPU and memory usage.

netperf - Netperf is a benchmark that can be used to measure the performance of many different types of networking. It provides tests for both unidirectional throughput, and end-to-end latency. - HewlettPack...