From WinAgents Software Group:
WinAgents TFTP Service is a fully-realized TFTP server for Windows. WinAgents TFTP Service runs as a background task and doesn't require permanent attendance. It has been originally designed to work in 24x7 background operation mode. Using WinAgents TFTP Service, you can make reserve copies of device settings, update flash images, store sound files for IVR systems and perform other useful operations. Key features of the service: implemented as a system service; fully compatible with RFCs 1350, 2347, 2348 and 2349; ensures flexible access rights setup according to client's IP-address; supports the options 'tsize', 'blocksize' and 'timeout; an option of setting a highest precedence for the sever process; supports multi-homed servers; high-performance multithreaded architecture. WinAgents TFTP Service supports firewalls: the server allows indicating the range of UDP-ports, used for transmitting the data. This allows network administrators to regulate firewall rules, approving the traffic, generated by the server.