Just download SQLEXPRWT_x64_ENU.exe from Microsoft Downloads – SQL Server® 2012 Express with SP1
You can get SSMS Express tools from here or full SQL Server Eval tools from here. MSDN/TechNet Downloads is currently the only place to get RTM versions (non-eval) of the SSMS 2012 toolset.
Note the first link now(dec 2017) points to ‘Microsoft® SQL Server® 2012 Service Pack 2 (SP2) Express’. ssms 2014 and 2017 are still available.