here are the files for the DDS Synthesizer:
Firmware: DDS-FIRMWARE (already installed on delivered boards, no need to upgrade)
PC-Software (runs under Windows, for Linux and Mac install MONO first):
WSPRRXTX: this is a full featured WSPR receive and transmit program running under linux. It has a waterfall diagram, spot lists and statistics and all the configuration for the U02-DDS Synthesizer for comfortable WSPR operation. DOWNLOAD HERE. The installation is explained HERE. The description focuses on the banana-PI but this software runs on almost every Linux based system (just make sure that a mono package version > 3.8.2 is installed).
some impressions from wsprrxtx: