New or change request status track for PAN card

https://tin.tin.nsdl.com/tan/StatusTrack.html

Indian Railway details

http://www.indianrail.gov.in/

INDIA, USA and UK railway station codes

http://www.stationcodes.com/railway-station-codes.htm

ISD (International Subscriber Dialing) code search for all countries--

http://www.bsnl.co.in/isdsearch.php

For INDIAN users - trace ur mobile numbers, vehicle registration details....

http://trace.bharatiyamobile.com/

About software stuff....

http://devilsworkshop.org/

Online help documentation about the OS & Softwares....

http://www.uwec.edu/help/index.htm