Downloading SdrDx 2.20 for Mac from the developer's website was possible when we last checked. We cannot confirm if there is a free download of this app available.
According to the results of the Google Safe Browsing check, the developer's site is safe. Despite this, we recommend checking the downloaded files with any free antivirus software. The most popular version of the tool is 2.1. The unique identifier for this program's bundle is com.yourcompany.SdrDx. The program relates to Audio & Video Tools. Commonly, this program's installer has the following filename: sdrdx-aa7as-light.zip. This free software for Mac OS X was originally produced by AA7AS.
From the developer:
SdrDx is an open source SDR software for Mac computers. This app supports RFSPACE, FunCube Pro, Andrus MK1.5, AFEDRI, FunCube Pro Plus, Peaberry, and Softrock SDR receivers. In addition, SdrDx can be made to support any SDR with a sound card interface, including I/Q input via your native or auxiliary sound card, with a little scripting work.
You may want to check out more software for Mac, such as CocoaRTLServer, which might be related to SdrDx.