Geral
Global Biodiversity Information Facility (GBIF) Data Portal free and open access to biodiversity data
World Birds BirdLife International
Observation.org observations worlwide, except Belgium and the Netherlands
national sites for birdwatchers: Portugal (PortugalAves), Portugal (BioDiversity4All), Bélgica, Holanda, França (antigo), Suiça, Hungria, Suécia, Marrocos, EUA
Birdstack create and share bird lists (closed out 25.02.2012)
Bird Journal Bluebird Technology
Wildlife Recorder Wildlife computing, software for birders and other naturalists
Nature Recorder software package for recording wildlife sightings
Which birding software? review of Birders Diary, AviSys, Wildlife Lister and BirdBase/BirdArea (Thayer Birding Software - Birders Diary World Edition Version 3.0.2; AviSys - Version 5.00E for Windows; Wildlife Computing Ltd - Wildlife Lister - Version 1.2.261 World Edition; Santa Barbara Software Products - BirdBase/BirdArea - 1 July 2004)
Birder's Diary software program that allows birders and naturalists to maintain detailed records of their sightings
BirdsEye tools for birders: BirdLog (eBird data entry for iPhone and Android), BirdsEye (eBird sightings finder for iPhone), BirdsEye HD (eBird sihtings finder for iPad)
Listas de espécies observadas
Surfbirds Life & Year List Rankings
ABA Listing Central North America north of Mexico
Reservoir Birds Listas Espanha
Cocheurs de France França
Netfugl rankings Dinamarca
Historical Rare Birds Reino Unido