The Lindon, Utah-based Unix vendor has included the open source Apache web server, MySQL database, and PHP and Perl programming languages with its SCO OpenServer operating system since the launch of OpenServer 6 in June 2005.

It is now pitching the technologies as a SCAMP stack, placing it squarely up against the Linux-based LAMP stack. SCO claims that Linux contains Unix code donated to the open source operating system in violation of agreements between it and IBM Corp.

At the beginning of its legal case against IBM the company took a broad anti-open source stance claiming that the GNU General Public License – used by both Linux and MySQL – violated the US Constitution, as well as US patent and copyright laws.

Since then its position has mellowed, and as well as including multiple open source tools in OpenServer 6, it also announced a deal with MySQL AB in September 2005 that saw it begin shipping OpenServer with MySQL 5.0 and the MySQL Network database update service in January.

While OpenServer 6 was launched in two versions, with the Starter Edition for two users costing $599, and the Enterprise Edition for 10 users costing $1,399, the SCAMP stack is licensed for five users and is available for $999 until July 31.