WineHQ - Run Windows applications on Linux, BSD, Solaris and Mac OS X
Open Source Software for running Windows applications on other operating systems.
apache friends - very easy apache, mysql, php and perl installation without hassles
XAMPP is an easy to install Apache Distribution for Linux, Windows, Mac OS X, and Solaris. The package includes the Apache web server, MySQL, SQLite, PHP, Perl, a FTP-Server and phpMyAdmin.