Python Graphic Library: http://www.pyqtgraph.org/
Quick, numpy support, selections, large data set support.
Via Mr. Ossmann:
Offline spectrum analysis: https://github.com/miek/inspectrum
Command Line SDR: https://github.com/simonyiszk/csdr
Requests:
Checksum/Parity/CRC detection techniques and tools.
Likewise for modulation parameter estimation.
