The first place to look for externals for SuperCard is the Xtend project which ships with the package. This project contains dozens of useful XCMDs and XFCNs written specifically for the program, and all can be used under the same license agreement as the SuperCard application.
Third-party vendors of externals for SuperCard include Mark Lucas of Wetware, Inc., Chilton Webb, Stephane Leys, Rocardo Sosa, Royal Software, Peter Baral, Kevin Harris, and Fourth World. See the appendix for contact information, etc.
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