What is the best free alternative to Little Snitch?

It pops up when the apps are encrypting files, installing helper or adding something to login files. You can ether allow it, or terminate them.

It monitors your mac's mic, webcam and their processes and pops up native notification with choices to either allow it or terminate the process. Also you can look it up in menubar if the mic or webcam are (still) running.

Visualize network activity in detail, get notified when new apps access the network, look out for malware, and block bad apps.