iperf3: A TCP, UDP, and SCTP network bandwidth measurement tool
Cross-platform, C implementation of the IETF QUIC protocol
An universal TCP client.
FreeBSD Multi PPP daemon
Robust and flexible VPN network tunnelling
A multi-threaded, multi-database tcp-based database insertion app.
DNP3 Outstation and client simulator, Source code Library, win, Linux
DNP3 Protocol Source code Library Outstation and client Win Linux
Encrypted UDP based FTP with multicast
One of the most advanced DNS Proxy and DNS Firewall in one product.
Snare Enterprise: bit.ly/Snare-Trial
Linux Server and Data-Center WAN Optimization
implementation based on the Richards Stevens book.
The virtual serial port driver for Windows.
A multi-platform universal log collector and forwarder
Pen is a load balancer for udp and tcp based protocols.
IPv4/IPv6 TCP Echo Server scaling to 100.000+ concurrent sessions
Simulate Bluetooth connections over TCP/IP