NetRat

A network debugging tool: open a TCP client, a TCP server, a UDP socket
or a multicast group, then send and receive data by hand while watching
the traffic in a log.

Features:

- TCP client, TCP server with a client list, UDP and UDP multicast
- HEX and text modes for both sending and receiving
- Timestamps, sender addresses, pause, receive to file
- Sending from a file with a progress bar, loop sending by interval
- Sent and received byte counters
- Changing the IPv4 address of a local network interface
- Russian and English interface

The network engine is portable C11 with no Qt dependency, so the same
code runs headless on embedded boards.