A Tcl extension which provides operators from Relational Algebra and works with Metakit data files:
   * http://www.vlerq.org/

See also:
   * Paper [http://www.vlerq.org/vlerq/346], presented at the [Thirteenth Annual Tcl/Tk Conference]
   * Pivot tables (also called "cross tabulation") [http://www.vlerq.org/vqd/358]
   * Wrapping sqlite and oratcl query result sets [http://www.vlerq.org/vqd/368]
   * [Ratcl-like API with sqlite backend]
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[RLH] This is very cool stuff!

2007-Feb-16: There is a starkit which runs on Windows, Linux, and Mac OS X at [http://www.equi4.com/pub/sk/ratcl.kit].
The ChangeLog for this starkit is at [http://www.equi4.com/cgi-bin/cvsweb/ratcl.vfs/ChangeLog?rev=HEAD].

This starkit includes the "Ratk" graphical view browser by Brian Theado.  
Here is an example with a pivot table (also called a crosstab, see also [crosstab a la Relations]):

[http://www.equi4.com/pub/etc/ratk2.png]

More information about this can be found on the Vlerq discussion wiki at [http://www.vlerq.org/vqd/358].
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