You can find it on itch.io or Steam , where it holds a "Positive" user rating. 2. Sniffnet (Network Monitoring Tool)
It’s built with Rust for high performance, uses minimal resources, and—most importantly—does not collect any user data. operation-sniff-free-download
Whether you're looking for a tactical stealth game or a powerful network monitoring tool, "Operation Sniff" and its related software "Sniffnet" offer some great free options. You can find it on itch
Here are the details for the two most likely things you're looking for: 1. uses minimal resources