http://michael.cleverly.com/nstcl/
nstcl is a Tcl package which reimplements many of the useful APIs and commands from AOLserver and OpenACS, making them available for use in Tcl/Tk applications & scripts.
nstcl is grouped into a set of subpackages, including:
Most notable of these is the nstcl-database package, and the "ns_db" API, which provides a common interface to various different database extensions.
As of version 1.0 nstcl now supports the following databases:
Extending nstcl to support a new database extension involves writing six (mostly trivial) procs.
nstcl makes use of string subcommands, such as string map that first appeared in Tcl 8.2. As a result, use with a modern Tcl (8.3.4+) is preferred. However, for those stuck with an older version of Tcl, a set of so-called "forward compatability" procs are provided that enable nstcl to function on Tcl 8.0+.
Database access requires a supported database extension. Certain features of nstcl make use of packages from tcllib. See the README for details.
nstcl is distributed under the terms of the MIT/X11 license (essentially the equivalent of the BSD license without the advertising clause).