Ookla Speedtest
Ookla® Speedtest® is the definitive way to test the performance and quality of an internet connection.
Go
Open Speedtest
OpenSpeedtest.com is a cross-platform application. So you can test your internet speed in various web browsers within different operating systems.
Go
Libre Speedtest
LibreSpeed - Speed Test. Free and Open Source Speed Test. No Flash, No Java, No Websocket, No Bullshit.
Go
Iperf3
iPerf3 is a tool for active measurements of the maximum achievable bandwidth on IP networks. It supports tuning of various parameters related to timing, buffers and protocols (TCP, UDP, SCTP with IPv4 and IPv6). For each test it reports the bandwidth, loss, and other parameters.
nPerf
nPerf, short for « network performance », is dedicated to assisting Internet users in assessing the quality of their connections, while also aiding both fixed and mobile operators in enhancing their services.
Go