From: http://www.how2shout.com/tools/best-free-opensource-bandwidth-management-tools.html

If you don’t want to go through the whole article then here is the list of tools.

    Solarwinds
    Wireshark
    BWM Tools: Bandwidth Management Tools
    Bandwidth Monitor
    NetWorx
    PacketFence
    Cacti
    ManageEngine NetFlow Analyzer
    BandwidthD
    Portty – Port Forwarding, Tunneling etc.
    MasterShaper
    PRTG Bandwidth Management
    Sarg
    Squid
    Internet Bandwidth Monitor(IBM)
    BitMeter OS
    NetBalancer
    Traffic Shaper XP

 http://www.ixchariot.com/products/datasheets/qcheck.html
 
 Qcheck, the network troubleshooting utility from Ixia, quickly checks network response time, throughput,
 and streaming performance. It even runs anywhere-to-anywhere traceroute!
 

 endpoint 
 
 QChenck and IxChariot tests use endpoints (unobtrusive software agents) installed at the source
 and destination points of a test. An IxChariot traffic pair is the two endpoints needed for one traffic session

 Web: www.ixiacom.com
 The latest versions of the endpoints are always available for
 free at http://www.ixiacom.com/support/endpoint_library/
 
 
 removal:  /usr/local/Ixia/endpoint -k