This is the GNU C++ compiler, a fairly portable optimizing compiler for C++.

Top level component library. Defines core blocks. Handles settings for logging, performance counters, and control port. Part of the main gnuradio build.

This is the GNU Objective-C++ compiler, which compiles Objective-C++ on platforms supported by the gcc compiler.

Library for trellis coding modulation, including the Viterbi Algorithm, Concatenated Coding and Turbo Decoding based upon finite state machine (FSM) class. Part of the main gnuradio build.

The gnuradio interface to the UHD library to connect to and send and receive data between to the Ettus Research, LLC product line - including the USRP family of software radio peripheral devices. Part of the main gnuradio build.

Library for handling SDL (Simple DirectMedia Layer) video data. Implements input and output blocks. Part of the main gnuradio build.