Bitrock stacks are based on a number of open source components:

The Apache HTTP server, developed by The Apache Software Foundation http://www.apache.org/.

PHP, freely available from http://www.php.net/.

The Zend Engine, freely available from http://www.zend.com/

Software developed by Greg Stein gstein@lyra.org for use in the mod_dav module for Apache http://www.webdav.org/.

Software developed by MySQL http://www.mysql.com/.

The PostgreSQL database: http://www.postgresql.org/.

The Mono Project:

• The C# Compiler and tools are released under the terms of the GNU General Public Library License GPL.
• The runtime libraries are under the GNU Library GPL 2.0 (LGPL 2.0).
• The class libraries are released under the terms of the MIT X11 license.

You can find the individual licenses for the above projects as part of the installation.