LAN Speed Test
LAN Speed Test was designed from the ground up to be a simple but powerful tool for measuring file transfer, hard drive, USB Drive, and Local Area Network (LAN) speeds (wired & wireless). It does this by building a file in memory, then transfers it both ways without effects of windows file caching and while keeping track of the time.
Passmark Performance Test 8
The PassMark Advanced Network Test, a part of PerformanceTest, is designed to test the data transfer rate between two computers both of which must be running PerformanceTest. One of the computers acts as the server and will wait for a connection while the other computer acts as a client.