Viper4Android
While the Wolfson DAC was the king of the past, (and probably still is), Qualcomm's onboard DAC can pump out surprising power once
Unfortunately, Viper4Android only supports Qualcomm for now: though nowadays, most devices use those chips.
One of the most powerful features of Viper4Android is to use Sony's fine-tuned Impulse Response scripts (Mega Bass, Clear Bass) on any Qualcomm device. You will need to get the scripts from somewhere, preferably a real Sony Android phone though.
- Viper4Android
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Oculus Rift DK2
- Kinect + Oculus Rift
- Nokia Lumia 1020
- Wolfson DAC
- OpenPandora
- HTC HD2
- Nokia N900
- Sony Ericsson Series
- Compaq Pocket PC Keyboard
- Windows for DOSBox
- Libreboot/Coreboot
- Phoenix BIOS Crisis Recovery - For pre-UEFI ThinkPads.
- Bricked T430 Motherboard
- HPLIP Printers - A massive family of common and cheap printers, that you can probably find from the junkyard. Most of them use open source drivers, and all work out of the box with Linux and HPLIP. Great for printing Bitcoin paper wallets.