Proxifier - Proxifier extends the advantages of a proxy server to network applications that don't natively support it.

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

redsocks - Redsocks is a daemon running on the local system, that will transparently tunnel any TCP connection...

JPerf - This project gives a better UI and new functionalities to the initial JPerf 1.

Proxycap - ProxyCap empowers you to divert your PC’s system associations through intermediary servers.

NetStress - NetStress is a user-friendly benchmarking tool that is mostly used by networking professionals to measure the network performance of both wired and wireless connections.