GeoJasper is a free and open source geo supporting command line transcoder between GeoJPEG2000, GeoTIFF and other formats. i.e. Converts image data from one format to another correctly transferring geo information between GeoTiff and GeoJpeg2000.
GeoJapser is an extension of the JasPer library and follows it's respective licence.
Free binaries available for windows (32/x64), mac (ibm/intel), linux and solaris (sparc).