CMake

CMake is an open-source publisher whose portfolio centers on FreeDV, a narrow-band amateur digital voice mode engineered for high-frequency radio communication. The software encodes and decodes low-bit-rate speech using the open Codec 2 vocoder, then wraps it in a robust modem that survives the noise, fading and interference typical of HF channels. Operators pair FreeDV with conventional SSB transceivers and a sound-card-equipped computer or embedded board to conduct keyboard-to-keyboard or push-to-talk QSOs across continents while consuming barely 1.2 kHz of spectrum. Advanced versions integrate adaptive synchronization, error-correcting codes, and optional 700/800/1600-bit-rate waveforms, giving hobbyists, emergency groups and experimenters a free alternative to proprietary DV systems. Because the project is released under LGPL/GPL terms, developers also embed the modem in custom hardware, link it to digital mode gateways, or fold it into larger ham-radio suites for logging, contesting and weak-signal experimentation. FreeDV software is available at no cost on get.nero.com; downloads are delivered through trusted Windows package sources such as winget, always installing the newest build and permitting batch installation alongside other applications.