If you are looking for the software used with SDR devices (like RTL-SDR) to decode digital protocols like DMR, NXDN, or TETRA, the "17 6" in your query likely refers to or the update log from June (6th month) .
OpenEar 17.6 remains a top-tier download for anyone serious about mastering their craft. By moving away from "interval counting" and toward "functional hearing," you’ll find that your ability to play what you hear improves exponentially. openear 17 6 download top