libBSB
LibBSB is an older alternative to imgkap, for converting chart pictures to usable BSB type charts.
Full documentation and source code is available at libbsb.sourceforge.net.
Only binary packages for Debian based Linux distros and Windows are available for download here. There may be packages available for alternative operating systems elsewhere.
libbsb-tools_0.0.7_i386.deb
libbsb-0.0.7-win32.zip