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 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. Main FeaturesManufacturer: Microsoft CorporationManufacturer Part Number: E32-00575Manufacturer Website Add... |
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SQL Server 7.0 Competitive Version Upgrade (5-client)
$613.99 SQL Server is the Relational Database Management System (RDBMS) of choice for a broad spectrum of corporate customers and Independent Software Vendors (ISVs) building business applications. Customer needs and requirements have driven significant product innovations in ease of use, reliability, scalability, and data warehousing. Microsoft's SQL Server 7.0 is the first database to scale from the lap... |