Is there a source (preferably free :) that provides a list of large intraday (versus pre market) movers for the day you look? I don't mind getting the list on market close. I don't need historical data, just data for the day I'm looking.
No Such source which provides you this information. You could write a script which periodically downloads the data from source pages/website and which could give you the required information.
Most indices let you download data in excel format. Custom configuration of excel could help you here.