StereoTool is a very competent Jack enabled Audio Processor / FM stereo / RDS Generator that runs on a decent 64Bit PC with a 192 kHz sample rate sound card. Here is a YouTube demo of Rivendell feeding StereoTool through Jack. You can see the components working, and then the setup in KXstudio Catia patchbay.
Nice! Where else can you get a complete radio station in a box? Just add transmitter and antenna.