LAMP
For server software, I recommend LAMP. LAMP consists of
Linux - the operating system
Apache - the web server
MySQL - the database
Php - the programming language
Other recommendations
For desktop software, I mainly use Ubuntu. However, I also use Windows (XP, Server, Vista) and Mac OSX - Snow leopard. None is perfect so I use them all. Btw... in my humble opinion, Firefox is the best browser and it works well in all operating systems.
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