Recently I was looking for a webcam for an old laptop running Linux. While searching for some compatible webcam, I mostly found information about chipsets, or the brands that aren’t readily available in Pakistan, and when they are, they aren’t too cheap.
The most common brand available here is A4tech, and the only posts I found about it were few years old with some people having issues with some specific model. Still, I went ahead and got one (PK-732G to be exact) and it works fine in linux. No driver or configuration required, just plug and play. As far as I know the chipset is pretty much same in all their models, so they should all work fine. Hopefully it will help someone else looking for the info.
TL;DR: A4Tech Webcams work in Linux.