LanChGo: LAN Tool

LanChGo is a lightweight and fast LAN app that lets you instantly connect with all devices on the same local network — no internet, no sign-up, and no accounts needed.
Just launch the app and start chatting, sharing files easily quickly.
Features:
Real-time LAN messaging (no internet required)
Secure Channel mode for encrypted chats using a PIN
Automatic device discovery
File transfer between Android and Windows
Web Companion — join from any browser on your network
Simple and clean interface
Works across Windows and Android

Perfect for offices, classrooms, labs, home networks, or anyone who wants fast, private, local communication without the cloud.
https://lanchgo.com
Windows, Linux versions (open-source):

https://github.com/elhijamuhammed/LanChGo