SharePoint
DoD 5012 / 5015 compliance
Section 508 Tools
http://www.section508.gov/technology-tools
Section 508 Firefox Plugin
https://addons.mozilla.org/en-US/firefox/addon/web-developer/
http://www.uwosh.edu/ploneprojects/docs/how-tos/how-to-validate-a-page-for-section-508-compliance
Office 365 Compliance
http://technet.microsoft.com/en-us/library/office-365-compliance.aspx
Government
STIG - SharePoint Security Technical Implementation Guide
http://iase.disa.mil/stigs/app-security/app-servers/Pages/sharepoint.aspx
Windows Server
SCM - Security Compliance Manager
http://technet.microsoft.com/library/cc677002.aspx
SCM Tools
http://technet.microsoft.com/en-us/solutionaccelerators/cc835245.aspx