Best bandwidth tools

Find which Linux process is using bandwidth

Measure throughput between controlled network endpoints

Attribute current traffic to processes and remote connections

Track bandwidth use, connection quality and usage history

A Windows usage meter with history export and a small widget

Check download and upload bandwidth separately

Simple incoming and outgoing bandwidth graphs in a terminal

Monitor Internet traffic through a desktop application

A console bandwidth view for interfaces and disk I/O

Throughput and responsiveness tests from the continuing iperf2 project

Keep persistent interface-traffic totals without packet sniffing

A consolidated suite for network measurements and discovery

Network statistics in an interactive terminal or script output