This is xplain2sql, an Xplain to SQL converter.
It's written by Berend de Boer <berend@pobox.com>.

The xplain2sql support page is http://www.berenddeboer.net/xplain2sql/.

Important files:

- doc/xplain2sql.pdf is the manual. It also contains installation
  instructions.

- If you don't have a pdf Reader, you can get one for free at:
  http://www.adobe.com/Acrobat

- LICENSE contains the licensing details. Basically, you can use
  this program for any purpose, including commercial purpuses. If
  however LICENSE doesn't fit your particular needs, contact the
  author to negotiate something else.