Apps similar to pwncat include netcat, which is free and open source. Other options are socat and Packet Sender. In total there are three Network Monitors like pwncat for Linux, Mac, Windows, Android and iPhone.
Netcat is a featured networking utility which reads and writes data across network connections, using the TCP/IP protocol. It is designed to be a reliable "back-end" tool that can be used directly or easily driven by other programs and scripts.
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socat, SOcket CAT, is a relay for bidirectional data transfer between two independent data channels. Each of these data channels may be a file, pipe, device (serial line etc. or a pseudo terminal), a socket (UNIX, IP4, IP6 - raw, UDP, TCP), an SSL socket, proxy CONNECT...
Packet Sender can send and receive UDP, TCP, and SSL on the ports of your choosing. All servers and clients may run simultaneously.
