OpenEar is a free, standalone Windows application that connects directly to an RTL-SDR dongle (a small, inexpensive USB device that can tune in to a wide range of radio frequencies). Once connected, it allows you to decode and listen to various digital radio protocols, including:
It has been reported that the primary GitHub repository for OpenEar is no longer available, which is common for projects of this nature. However, the software is still available for download from various software repositories and community archives. openear 17 6 download top