I mirror this sentiment so much as well.

Not aware of a list or something, but before buying any appliance I try searching if it's "jailbreak-able".

For example I'll search if the router I want to purchase has guides to install openWRT on it, how hard it is to break out of the vendor software loop.

Recently even my Aircon had a mandatory app that it required to even finish installation. I got so pissed I dumped the firmware and reverse engineered the protocol enough to figure out how to set fan speed, temperature and mode. Sitting in the sweltering New Delhi heat really expedited the process.