Build your own Memcached server. Implement the TCP based Memcached protocol and build a Memcached server. ...

Build your own NATS Message Broker. Implement the TCP based NATS protocol and build a NATS Message Broker. ...

Build a network modelling tool that can load in a network description and some traffic data, then model the traffic flowing over the network to determine the utilisation of each link within the network. ...

An NTP client helps keep your local machine / server’s time in sync with other machines and perhaps authoratitive clocks. ...

This challenge is to build your own version of John the Ripper or CrackStation. These are password cracking tools that can be used to recover passwords, by penetration testers and of course bad guys. ...

Pong is a table tennis-themed game that Atari originally released in 1972. It was apparently the first commercially successful computer game and a key part of establishing the computer gaming industry. ...

A port scanner is an program that probes a host to identify open network ports. Malicious actors use port scanners to find network services running on a host in order to find and exploit vulnerabilities. Security analysts and network administrators use port scanners to confirm network security policies are being complied with. ...

Build a QR Code Generator. ...

Build your own API Rate Limiter, ready to sit in front of your API. ...

Build your own real-time chat server and client. ...