My name is Luke and I used to run Klinker Apps. Check out Pulse SMS to get a better idea of the types of services that I have created: https://home.pulsesms.app/overview
I built and open-sourced Pulse SMS over a few year period, then sold it in 2020. I also built and maintained Talon, a third party Twitter client, for around 10 years before Twitter shut off access for third party apps.