This made-to-order controller from Return to Paradise adds five linear slider controls to your Windows or Linux PC (sorry, no Mac support). It can be used to map volume controls and faders in DJ and gaming software via a USB connection. It works right out of the box with the open-source app deej.
This pocket-sized computer runs a full version of Debian 10 w/mainline Linux, and packs a 1080p touchscreen display, a full QWERTY keyboard, expandable storage via SD card, 4x USB-C connectors, Wi-Fi, Bluetooth, and more. There’s also a version with LoRaWAN tech for low-power, long range communications. Available 8.2020.