Sharepoint 2010 Foundation

http://www.microsoft.com/downloads/details.aspx?displaylang=en&FamilyID=49c79a8a-4612-4e7d-a0b4-3bb429b46595

Sharepoint 2010 Designer

http://www.microsoft.com/downloads/details.aspx?displaylang=en&FamilyID=d88a1505-849b-4587-b854-a7054ee28d66

Other Sharepoint related software

http://www.microsoft.com/downloads/en/results.aspx?pocId=&freetext=sharepoint&DisplayLang=en

Sharepoint 2010 Server and other licensed software can be downloaded with MSDN subscription