http://www.low-cost-airline-guide.com/en/routemap.htm
http://www.skyscanner.com/cheap-flights-map
http://www.flycheapo.com/flights
http://www.attitudetravel.com/lowcostairlines/europe/#map
http://www.airlineroutemaps.com/Europe/index.shtml
http://www.eurocheapo.com/flights
http://www.cyto.purdue.edu/flowcyt/cheapflights.htm
http://en.wikipedia.org/wiki/List_of_low-cost_airlines
http://www.thirtythousandfeet.com/travel_deals.htm
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Lifted from flyertalk
http://www.flyertalk.com/forum/archive/t-468908.html
GENERAL REFERENCE SITES
http://www.whichbudget.com/?lang=en
EUROPE
European LCC's
http://www.flylowcostairlines.org
http://www.ryanair.com/site/EN
http://www.tuifly.com/en/index.html
http://www.jet2.com/cgi-bin/airkiosk/I7/181002i?LS=2&LANG=EN
http://www.aegeanair.com/aegeanen/home/index.asp
http://www.norwegian.no/sw7127.asp
http://www.kullaflyg.se/Booking1.asp
http://wizzair.com/index.shtml
http://www.skyeurope.com/start.php?lang=en
http://www.helvetic.com/en/Default.aspx
http://w3.volawindjet.it/default.aspx?lang=gb
http://www.vueling.com/EN/index.php?mode=
http://www.arkefly.nl/arkefly/search/searchFlight.do
http://www.atlasjet.com/en/default.asp
http://www.hifly.aero/default.aspx?lang=en&action=home
http://www.welcomeair.com/CMS_WLC/
http://www.girjet.es/index2ing.php
http://www.clickair.com/view/default.aspx?lang=2
http://www.atlas-blue.com/en/index.php
http://www.airbaltic.com/public/index.html
www.bestflights.com.au has a dedicated LCC search engine "from anywhere to everywhere" they claim to be able to bookflights through more than 70 LCC's occasionally have found fares cheaper on there than through the LCC directly. Good option for Aussies planning travel around the world.^
An outstanding site for a U.S. based passenger who was having mucho trouble booking a European LCC with a U.S. issued credit card. No problem at all making the booking via bestflights.com.^^
Consolidators
http://www.openjet.com/public/index.jsp
http://www.air-europa.com/en/default.html
http://www.europebyair.com/eba/English_us/default.jsp
http://www.sterlingticket.com/en/forside_en
NORTH & SOUTH AMERICA
Canada
http://c1dsp.westjet.com/guest/home.shtml?language=EN
http://www.airtransat.ca/en/0_0.asp
USA
http://www.spiritair.com/welcome.aspx?utm_source=spiritcom&utm_medium=link&utm_campaign=promo
http://www.frontierairlines.com
MEXICO
http://www.aerocalifornia.com.mx
BRAZIL
http://www.voegol.com.br/INT/index_ie.asp
http://www.tam.com.br/b2c/jsp/default.jhtml
ASIA, AUSTRALIA & INDIA
http://www.nokair.com/nokconnext/aspx/welcome.aspx?currlang=en-US
http://www.hongkongexpress.com
http://www.fly12go.com/en/main.shtml
http://www.garuda-indonesia.com
http://www.flyvivamacau.com/en
Consolidator:
INDIA
http://www.indian-airlines.nic.in
http://www.paramountairways.com
Consolidators:
Matrix of cheap flights in India
AFRICA
http://www.fly540.com Kenya, Tanzania, Uganda
MIDDLE EAST