Open source. Open possibilities.

A TypeScript TCP ping utility for testing host reachability and measuring latency with configurable attempts, ports, and timeouts.

croc is a cross-platform CLI tool for securely sending files, folders and text between any two computers using end-to-end encryption and PAKE code phrases, with relay fallback, resumable transfers, a browser client, and self-hostable relays.

stab is a simple, compact, high-performance TCP tunneling tool that exposes local ports to remote servers, featuring heartbeat detection, traffic statistics, web management, multi-port mapping, auto-reconnect, and a local IPC API.

CIM (Cross IM) is a distributed instant messaging system built for developers using Java, Spring Boot, and Netty. It provides scalable architecture for IM, app message pushing, and IoT connectivity, featuring group/private chat, AI mode, and delayed messaging.