Useful Links

www.nanpa.com
Find North American codes by a map, number, or location. Includes information on future planned area codes and a free downloadable area code database.

www.localcallingguide.com
A free resource mainly aimed at telecommunications companies. Users can browse tabular data on North American area codes, numbering scheme and prefix information for Canada, the United States of America, and other countries which are part of the North American Numbering Plan.

www.voip-info.org
This Wiki covers everything related to VOIP, software, hardware, service providers, reviews, configurations, standards, tips & tricks and everything else related to voice over IP networks, IP telephony and Internet Telephony.

www.linux.org
Comprehensive information and resources about the Linux Operating System

http://www.timeanddate.com/worldclock
Related time zone tools. Search for a city and find local time, personal world clock, Time Zone Converter