SQL Relay http://sqlrelay.sourceforge.net/

From SQL Relay's home page:

SQL Relay is a persistent database connection pooling, proxying and load balancing system for Unix and Linux.

SQL Relay supports the following database backends:

   * Oracle
   * MySQL
   * mSQL
   * PostgreSQL
   * Sybase
   * MS SQL Server
   * IBM DB2
   * Interbase
   * Sybase
   * SQLite
   * Lago
   * ODBC
   * MS Access

SQL Relay includes a Tcl interface in the source distribution.
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The documentation page [http://sqlrelay.sourceforge.net/documentation.html]
provides this list:

"SQL Relay provides native client API's for many different programming languages."

 Guides:

  C++
  C
  Perl
  PHP
  Python
  Ruby
  Java

 References:

  C++
  C
  Perl
  PHP
  Python
  Ruby
  Java

Tcl is not mentioned on the documentation page, despite being mentioned on the home page.
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[Category Database]