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A Tcl interface to PostgreSQL databases, written in Tcl
pgintcl is a Tcl interface to the PostgreSQL database system, written entirely in Tcl. It is mostly compatible with other pgtcl implementations, especially pgtclng. It lacks asynchronous operations, and is somewhat slower, but it does not require any other libraries. (This project was on pgfoundry.org and its predecessor from Feb 2003 through Mar 2011.)
A library to process X-ray images from the Heimann imaging system. The XGray library has interfaces to C++ and Tcl and includes the graphical program XRayLab, which is written Tcl.