Cleartrip.com provides the excellent feature to get the train ticket availability for the no of days at one shot. Cleartrip calender is the famous one in the web to check the ticket availability. IRCTC provides only availability of tickets for the next 5days from the date of travel. But cleartrip provides till the last day of ticket availability ie. till 4months . Screenshots provided below.
Regular updates about New and Special trains announced by Indian Railways.