Fan Kit - Fan Control
Atom Lite - Speed Control - Default
For my fan kits I use the PWM controller Atom Lite and I have developed a small firmware for it via Ui Flow. By the way, Ui Flow only because I want everyone to be able to customize this firmware according to their needs.
Atom Lite - Speed Control - Connect
Firmware that allows control via Wifi or BLE would be even cooler, but even if the Atom Lite can do it, I currently don't have the time to develop such a firmware including an app.