phyphox has an Audio Amplitude feature.

basic flyers & ads, restaurant menus

For this sort of things, LibreOffice Draw can be really good. I even used it in the past to create memes.

It supports any ONVIF compatible IP camera as well as USB cameras and the raspberry pi camera module

MotionEye used to be the go-to solution.

I am not sure about the current state of the project (the python 2/3 transition took a long while, there are only pre-releases using a modern python version).

Some people also swear by other measures, like changing the SSH port to something else. Most people end up using 2222 to easily remember. This is borderline useless, as you can see for yourself.

While being useless against a sophisticated attacker, there hasn’t been any bot activity in my sshd logs since changing my ssh port to a different one.

Declaring the use without a paid license as “Unlicensed” is very misleading since the project is also licensed under the GNU AGPL v3.0.