There are lots of websites that can help improve your time online. This page is intended as a non-exhaustive list of links to free resources that might help you when flying online. You will also find plenty of resources available on local websites.

Charts

AirCharts A popular website storing charts from around the world for the virtual aviation community.
VATSIM Charts An old site with links to various chart sources. (Some links are outdated)

Who's Online

VATSIM Statistics List of currently connected members
AccuMap A Windows & Mac program displaying a live map with accurate depiction of sectors
VATSpy A Windows program displaying a map of pilots and controller locations
vRoute Windows program showing online members by country
Vattastic Browser map of pilots and controllers
QuteScoop An open-source multi-platform traffic viewer

Flight Planning

vRoute vRoute accepts flightplan submissions from members around the VATSIM world.
Simroutes A collection of flightplans, predominantly for USA routes
VATroute A collection of flightplans, predominantly for European routes

Training

VATSIM Pilot Resource Centre Tutorials and guides for the basics of flight.
Official ATO Listing Links to all of the Organizations authorized to perform