OSSIE is an open source Software Defined Radio (SDR) development effort based at Wireless@Virginia Tech. The project's primary goals are to enable research and education in SDR and wireless communications. The software package includes: an SDR core framework based on the JTRS Software Communications Architecture (SCA); the Waveform Workshop, a set of tools for rapid development of SDR components and waveforms applications; and an evolving library of pre-built components and waveform applications. In addition, free laboratory exercises for SDR education and training are being developed in cooperation with the Naval Postgraduate School. OSSIE is distributed under the GNU General Public License 2.0 or later (signal processing components and tools) and GNU Lesser General Public License 2.1 (core framework). If interested in alternative licensing possibilities, please email ossie at vt dot edu.