Sql Server Versions

There are all versions of MS SQL, which are free and able to handle a live web server / production environment?
We have a non-profit. We shared hosting now and considering moving to a new server installation. We do not want to use MySQL. There is a non-profit version of SQL available? Or SQL Express can manage the use in a production environment?
SQL Exercises site (http://www.sql-ex.ru/) using SQL Server 2005 Express.
SQL Server 2005 Part 2.7
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Microsoft SQL Server 2000 Developer [OLD VERSION]
$49.99 Microsoft SQL Server 2000 Developer Edition English North America CD... |
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Microsoft SQL Server Developer Edition 2005 [OLD VERSION]
$49.95 Marketing Information: Achieve higher levels of database scalability with SQL Server 2005 (64-bit), the enterprise-class database optimized to run on x64- or Itanium-based servers and Microsoft Windows Server 2003. The 64-bit features are available on SQL Server 2005 Standard, Enterprise, and Developer editions.Product InformationSoftware Sub Type: DBMSSoftware Name: SQL Server 2005 Developer Edit... |
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SQL Server Access 7.0 License Competitive Version Upgrade (5-client)
$320.99 ... |