The main online resource currently is the WTaxa species catalogue by Miguel Alonso-Zarazaga and Chris Lyal , based on their 1999 catalogue of family and genus group names, with a large number of unchecked species names added. This can be accessed through these pages. http://wtaxa.csic.es/
An additional resource is the Index of Organism Names, ION, based on Zoological Record, which can be accessed here (http://www.organismnames.com/).
Names and unique identifiers for those names can also be retrieved from uBio (http://www.ubio.org/).
The International Code of Zoological Nomenclature. The Code dictated how we handle nomenclatural issues. It can now be found online at http://www.iczn.org/iczn/index.jsp Other aspects of the work of the International Commission on Zoological Nomenclature, which oversees the Code, can be found at http://www.iczn.org/

ZooBank is the developing registry of Zoological names, created by the ICZN. It will function as a Zoological Nomenclator. More information can be found at http://www.zoobank.org/
The Global Names Index 'GNI' is a big collection of Scientific Biological Names, names like 'Homo sapiens' but not like 'Human', 'Человек' or ''男人'. Anybody can add a list of their own scientific names to GNI. GNI is a hub where researchers can find scientific names collections similar to their own. GNI is meant to collect all Scientific Names created, cited, misspelled in one place and then make sense of them. Global Names Index is a first component of a bigger collaboration endeavor -- Global Names Architecture (GNA). Global Names Architecture purpose is to organize knowledge about species names and taxonomic classifications and make it possible for scientists to discover and use this knowledge. It can be found at http://www.globalnames.org/name_strings