You can do it with a rpi, ir diode and resistor even. The tool for sending and receiving ir commands is called lirc

Huawei and Xiaomi phones have IR blasters as well. I always try to buy phones that have those, because A) "i lost the remote" and B) "shut off every TV at the store" is hilarious.

The first device i had that had this was a Palm, and it wasn't like "here's a remote control" it was "this 1 button will cycle every known TV IR code for the power button." Someone eventually released an actual IR blaster app for Palms, though.

Some old Samsungs have it as well, such as the Galaxy S5.