David Turnbull, AE9RB, created and sells kits for the Peaberry SDR V2. It is a Software Defined Radio transceiver that includes ADC and DAC circuits. website
Peaberry SDR V2 circuit board<br>after assembly.
Advertised features include:
Twenty-First Century Amateur Radio project provides a compatible http server for interactive digital signal processing. The mission is to find a solution that enables development of radios using open and approachable technologies such as HTML and Javascript. github