Etherstack is a provider of wireless communications software for the land mobile radio and defense industries in Europe, Asia, and North America. Their products include wireless protocol stacks, IP-based communication networks, software-defined radio, and Software Communications Architecture-compatible waveforms. Etherstack develops and licences wireless technology to third-party vendors. It is a licensor of standards-based APCO P25, DMR, TETRA, and NATO technology. Wikipedia