When searching for oscilloscope sofware for any Raspberry Pi 3 OS I can't find any that I can feed data. Some are for special hardware I don't want to buy.
I got my own ADC and since it outputs data for 7 segment LEDs I will be converting it to a digital input for software that can then project it in an oscilloscope GUI. (Digitizing ADC samples)
I don't know if there is such a software that can be handled by your own program as I want to, would be great if someone knew one. It should be able to go to at least 44kHz and maybe have an analyzer and function generator. Ideally for raspbian :)