I mentioned...

Microsoft Visual Studio Express

...in a blog item last week about the recently released Microsoft Robotics Studio. The Visual Express series includes six (6) free development tools from Microsoft.

1. Visual Web Developer 2005 Express Edition
   
2. SQL Server 2005 Express Edition
   
3. Visual Basic 2005 Express Edition
   
4. Visual C# 2005 Express Edition
   
5. Visual C++ 2005 Express Edition
   
6. Visual J# 2005 Express Edition
   

You can get more details about this developer tools series from the Visual Studo Express Editions FAQ.