Structures, names, and properties: Use chemical name, CAS Number, molecular formula, or molecular weight. Get structure, alternate names, properties, and other resources.

General Nomenclature:
ACD IUPAC Nomenclature rules:
IUPAC:   Nomenclature rules for every subject
CNS Chemical Nomenclature Service:  Send structural formula and have an answer in three working days.  Choose between pure IUPAC-nomenclature, Beilstein variants, and Chemical Abstract variants.  Price is based on the number of names desired.
ChemFinder:  Enter a chemical name, CAS number, molecular formula, or molecular weight.

Organic Nomenclature:
organic: http://www.mpcfaculty.net/ron_rinehart/organic.htm
<http://www.mpcfaculty.net/ron_rinehart/organic.htm> where I have the two
nomenclature sites already posted to the list by others and a third site as
well.
 

Basic Organic Nomenclature:  Contains basic information about root names, constitutional and enatiomer isomers, prefix order, cycloalkanes, bicyclic alkanes, functional group prefixes and suffixes, and sterochemistry.
Functional Group priority:  This site list the order of priority of the major functional groups, and includes suffixes.
Organic nomenclature:  Detailed steps in order for naming organic compounds.  Includes information on root word names, suffixes, and prefixes
Name expert:  Understands IUPAC organic nomenclature rules.  Enter IUPAC chemical name and it creates a corresponding structure in one of three styles: Shorthand, Kekule, or semi-structural formulas.
Reaction Index:  A database of organic reactions.  Intended to for a nomenclature system for transformation and reactions.
Oxford ( American Chemical Society) online database:  Nomenclature information for almost any organic compound.  Search engine provided.
Nomenclature:  Revision of the extended Hantzsch-Widman system of nomenclature for Heteromonocycles
Biochemical Nomenclature:  Recommendations for Biochemistry and organic nomenclature, as well as symbols and terminology.
Chemical Resources:  Lists of books with information on organic chemistry and nomenclature.

Inorganic Nomenclature:
Oxford (American Chemical Society ) Online database:  Nomenclature provided for almost any inorganic compound.  Search engine provided.
Inorganic Nomenclature:  Provides information on naming, five types of inorganic compounds, binary inorganic and covalent inorganic.  Quizzes and practice programs.
Nomenclature of Coordination Complexes:   Detailed list of steps and rules for naming inorganic compounds.  Includes information on special names and use of brackets.
Basic Inorganic Nomenclature:  Basic rules for naming simple inorganic compounds.  Lists common anions and cation, plus names, formulas, and charges.
Inorganic Nomenclature Resource:  Contains information on writing names and writing formulas.
Inorganic Nomenclature Database:  Complete descriptions of the nomenclature of the five types of inorganic compounds.

by David Stiles, Herb Hedgecock, & others at Morehead State University