A Tcl interface to PostgreSQL databases, using PostgreSQL libpq
pgtclng (PostgreSQL Tcl Next-Generation) is a loadable Tcl module for accessing PostgreSQL databases. It was forked from pgtcl in Feb 2004, moved to pgfoundy.org in Aug 2006 and to Sourceforge.net in Mar 2011. Its API is a superset of the pure-Tcl companion project pgintcl.
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.)