The PCIDSK SDK is a C++ Library for reading and writing the PCIDSK (.pix) geospatial file format used as the primary format of the Geomatica and related software from PCI Geomatics. The library is available under an Open Source license, and it's development is funded by PCI Geomatics. The primary author of the library is Frank Warmerdam (firstname.lastname@example.org).
As of November 2009 the library is still under development, but preliminary versions are now available.
Packaged source distributions should be available in the downloads area.