I was originally going to scold the GP for a shallow dismissal and shitting all over a perfectly good application that runs on the best operating system in development today, Microsoft Windows.
But I also have a soft spot in my heart for Linux and I thought I would instead mollify the GP by pointing out that there really is Linux software for his Software-Defined Radio.
Little did I suspect that the GP wants all of the special features that SkyRoof offers, such as hyperencabulation of quasicosmic quantum wave collapse, a genuine pair of cathode ray boobs, and also don't forget the 1.7 jiggawatt zener diode that is included free with every subscription.
The only thing that seems kind of similar (sdr-radio.com) is also Windows only.