NanoSound was successfully funded at Kickstarter in August 2017. NanoSound DAC is a Raspberry Pi Add-on Board with HIFI DAC, LDO Voltage Regulator, OLED Display, Power Switch, Control Buttons and Infrared Remote.
NanoSound DAC Basic for Raspberry Pi
NanoSound Amp^2 for NanoSound DAC
NanoSound DAC Pro for Raspberry Pi