Official site: https://www.obdev.at/products/littlesnitch/index.html

Popular in:

2024 (118 points, 13 comments) https://news.ycombinator.com/item?id=42545009

2017 (337 points, 219 comments) https://news.ycombinator.com/item?id=13443858

Recently available for Linux too (1378 points, 474 comments) https://news.ycombinator.com/item?id=47697870

Do not forget opensnitch https://github.com/evilsocket/opensnitch for Linux.

Fist program to be installed.

If you never used, you don't know what is "going" on the pc.