What are /r/kangarooPC's favorite Products & Services?

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TwomonUSB works well for me, I bought the apps for Android and iOS and use it with the KPC. http://www.easynlight.com/ its not the most intuitive and could really use an English users guide but it lives up to its claims. It turns a PC, Android phone or iOS tablet into a monitor over a USB port.

Forgot to mention, parts used;
ATTINY85 Miniature USB Development Board. Around $5
iUniker Raspberry Pi 3 B+ Dual Fan with Raspberry Pi Heatsink. $13

This is enough to keep it from melting, need more optimization for better performance.