[nonamenoslogan]

I use LuLu, it works great. Its kept my older versions of Photoshop and Acrobat from complaining and showing me ads for newer versions for the last couple years!

[djkoolaide]

Tossing in a suggestion for Vallum[0] here. It's not FOSS but very polished and a fraction of the cost of Little Snitch.

[0]: https://vallumfirewall.com/