iperf3: A TCP, UDP, and SCTP network bandwidth measurement tool
Cross-platform, C implementation of the IETF QUIC protocol
FreeBSD Multi PPP daemon
Robust and flexible VPN network tunnelling
DNP3 Outstation and client simulator, Source code Library, win, Linux
Encrypted UDP based FTP with multicast
One of the most advanced DNS Proxy and DNS Firewall in one product.
Linux Server and Data-Center WAN Optimization
A multi-platform universal log collector and forwarder
Pen is a load balancer for udp and tcp based protocols.
Simple C++ CPU and Memory monitor through UDP protocl
Linux game server UDP flood analyzer and protector