Useful links

Amphibia.my: http://amphibia.my/index.php. This website provides photographs and basic information on the frogs of peninsular Malaysia. 

Amphibians on the IUCN Red List (formerly the Global Amphibian Assessment):  http://www.iucnredlist.org/initiatives/amphibians. A valuable website that provides maps drawn by regional experts for all species of amphibians as well as comprehensive information on conservation status. This is a canonical site for conservation information although it lags behind the systematics community due to financial constraints. See Ficetola, Rondinini, Bonardi, Padoa-Schioppa, and Angulo, 2014, J. Biogeograph., 14: 211–221, for discussion of accuracy. ASW links out to the species records from this site. 

AmphibiaWeb: http://www.amphibiaweb.org/. An important site for access to information on amphibian conservation, population declines, as well as other general information about and images of many amphibian species, directed at the informed public and conservation scientists. The taxonomy employed tends to lag behind the systematics community. ASW links out to the species records on this site. 

Anfíbios de Colombia: http://www.batrachia.com/. One of the very best websites for one country and because Colombia is a serious hot-spot of amphibian diversity this is a very useful site. 

AmphibiaChina: http://www.amphibiachina.org/ (Mandarin); https://translate.google.com/translate?hl=en&sl=zh-CN&u=http://www.amphibiachina.org/&prev=search (English translated page). A website dedicated to providing information on the Chinese amphibian fauna, led by Che Jing of the Kunming Institute of Zoology, China. ASW links out to the species records from this site. 

Anfibios de Ecuador: https://bioweb.bio/faunaweb/amphibiaweb (splash page); https://bioweb.bio/faunaweb/amphibiaweb/BusquedaEspecies (query page). A very up-to-date site on the amphibians of Ecuador, one of the most biodiverse countries in the world. Species records are linked to the relevant species records in ASW. ASW links out to the species records from this site. 

Herpetological Taxonomy and Systematicshttps://www.facebook.com/pages/Herpetological-taxonomy-and-systematics/751055144919750. A source of recently named species and taxonomic change in herpetology. Does a good job of reporting new taxa. 

ARKive. Images of Life on Earth (Amphibia page): http://www.arkive.org/amphibians/. This website is dedicated to informing the public about threated amphibians (and all other threatened species as well) via multimedia. Explore and search for videos, photos, and facts about endangered species. Arkive is an IUCN partner.

Biodiversity Heritage Library: http://www.biodiversitylibrary.org/. A remarkable free online source of biodiversity publications that are out of copyright and many (e.g., KU series) that are still in copyright. I use this site almost daily. 

CalPhoto Images: http://calphotos.berkeley.edu. A great resource for images, maintained by Biodiversity Sciences Technology (BSCIT), part of the Berkeley Natural History Museums at the University of California, Berkeley.

Catalogue of Life: http://www.catalogueoflife.org/). A site the provides taxonomic information on all taxa of life. Useful for rapid look-ups of currently accepted names and spelling and since it is funded by various European sites, not subject to the vagaries of the U.S. National Science Foundation and therefore likely to grow as an important resource. 

Encyclopedia of Life (Amphibia page): http://www.eol.org/pages/1552. On the way to becoming an amazing resource for information on all species of life. The tie-in to the Biodiversity Heritage Library should make this site very useful for professionals.

Global Biodiversity Information Facility (GBIF, Amphibia page)https://www.gbif.org/species/131. Search on species names for range maps and access to dot maps and links to specimen several databases and websites. Useful for professionals with reasonable caution inasmuch as IDs in major collection often need to be verified. An exceedingly useful website for professionals in conservation biology and systematics. 

Google: http://www.google.com/. The fastest way to locate information, albeit disorganized, on any taxon is to search for it on Google. But, like any unvetted information source, errors exist.

iNaturalisthttps://www.inaturalist.org/. A citizen scientist site at the California Academy of Science that does a great job of keeping up with amphibian taxonomy and it has also allowed me in some cases (like Incilius nebulifer) to check photographs of extralimital records. While identifications should be used with reasonable caution, the system provides considerable feedback from users to correct misinformation. I am impressed. 

ITIS (Integrated Taxonomic Information System: ITIS Amphibia record). ITIS is a United States Department of Agriculture system for storing information on all organismal names. ITIS is current operating off a 2009 version of ASW, which means that it is lacking nearly 1400 species of amphibians named since then, this number also not including the rather large number of revisions of then-existing species that have happened since this. Your tax dollars at work. 

Mikko's Phylogeny Archive: http://www.helsinki.fi/~mhaaramo/metazoa/deuterostoma/chordata/amphibia/lissamphibia/lissamphibia.html . A useful site for access to phylogenetic information and comparisons of different taxonomic arrangements. 

National Amphibian Atlas: http://igsaceeswb00.er.usgs.gov:8080/mapserver/naa/. This site contains reasonably good maps of the distributions of amphibians in the United States, although in some cases counties seem to be the unit of occurrence, and without accompanying text it is difficult to evaluate the sometimes significant differences between these maps and those in the more traditional field guides.

Scientific and Standard English Names of Amphibians and Reptiles of North America North of Mexico: http://www.ssarherps.org/pages/comm_names/Index.php. The recommended English names of the three major herpetological societies in North America (Society for the Study of Amphibians and Reptile, Herpetologists' League, and American Society of Ichthyologists and Herpetologists), with comments on taxonomy. ASW and this list do differ in places, but in each case these reflect genuine scientific controversies. 

SystTax: http://www.biologie.uni-ulm.de/systax/ . An online German GBIF database for systematics and taxonomy, relevant to us because it provides access to the ZMB type collection of amphibians, at least so far in my viewing, with images. A useful search string for querying ZMB amphibian types is: http://www.biologie.uni-ulm.de/cgi-bin/query_all/query_all.pl?query=genus+species , where genus and species name of the original type is entered. Apparently SysTax also allow access into collection records of a large number of German systematic collections, including the Senckenberg Naturhistorisches Sammlungen Dresden, but I have not investigated any of these other institutions.  

Translations of the Scientific Names of the Reptiles and Amphibians and Amphibians of North America: http://ebeltz.net/herps/etymain.html. Lots of interesting and helpful biographical and etymological information on USA and Canadian amphibian and reptile names from the indefatigable Ellin Beltz.

Tree of Life: http://tolweb.org/tree?group=Living_Amphibians&contgroup=Terrestrial_vertebrates. This site (not associated with the NSF Assembling-the-Tree-of-Life Program, which marked the rather corrupt end to substantial support of systematics efforts by the U.S. National Science Foundation, which is now funding at something like 4% of received proposals in systematic studies) provides a basic source of information regarding the evolutionary history for all major taxa of amphibians optimized on educational outreach. The contents and badly "under construction" and substantially out of date in most amphibian groups. A great concept, however.

VertNet: http://portal.vertnet.org/. This valuable site ties together collection data for most of the important herpetology collections in North America. Of great utility to biodiversity specialists but likely to be overinterpreted by naive informaticists.  

Wikipedia: http://www.wikipedia.org. While Wikipedia overall is a remarkable resource for general information and is self-policed relatively well, the English version has from time to time contained considerable taxonomic misinformation and/or dysinformation promoted by unethical persons with only a passing relationship with the truth. I have tried to fix some of the egregious propaganda, only to find the dysinformation back again the next day. I think that this finally came to the attention of Wikipedia editors who have gotten control of the problem, but caution is warranted. Having written that, I must comment on the fact that the French and Spanish versions of Wikipedia (http://fr.wikipedia.org/ and http://es.wikipedia.org/, respectively) seem to be doing a responsible job towards taxonomy generally and amphibians specifically.  

Wikispecies: http://species.wikimedia.org/wiki/Main_Page. A website that intends to have a page for every taxon. Unfortunately, like Wikipedia, although it is improving, a significant amount of the content related to amphibian systematics occasionally contains records that are either poorly researched or is simply reflect misinformation by people with big political agendas.