Hi, I just wanted to share a graphics library I have been working on called the GRX3 graphics library. It is intended for users of small TFT and OLED screens. It can handle monochome screens (1bpp) and has touchscreen support among other things. Packages are available for Debian Stretch.
I have made a video that gives a general overview of how to get the library setup and there are some sample programs to help you get started. The video uses Raspberry Pi as an example, but it works on BeagleBone too.