Is there a complete list of Online operations for each SQL Server version?
Sounds like an undertaking. Online index operations are not available in every edition of Microsoft SQL Server, hopefully this can get you started (it's in table form):

SQL Server 2012:
http://msdn.microsoft.com/en-us/library/ms190981.aspx

SQL Server 2008R2: http://msdn.microsoft.com/en-us/library/ms190981(v=sql.105).aspx

SQL Server 2008: http://msdn.microsoft.com/en-us/library/ms190981(v=sql.100).aspx

SQL Server 2005: http://msdn.microsoft.com/en-us/library/ms190981(v=sql.90).aspx