(... and Cloverleaf, for those wondering about the Tcl connection, uses Tcl extensively as an internal scripting language. It used to use Tk for its GUIs, but I think most of them have been rewritten in Java. Pity. --Bryan Oakley)
[What are HL7 and Cloverleaf?]
Cloverleaf is a product of Quovadx (which aquired Healthcare.com, which was formerly known as HDIE, which aquired Healthcare Communications, the originator of the product). Cloverleaf is an "integration engine".
HL7 is a format for data interchange in the healthcare industry.
For the time being, some of this information may still be available at http://www.healthcare.com .
(Bryan Oakley, who used to work for Healthcare Communications a few years ago...)