Simon Fraser University
Chem1 Virtual Textbook: Some Important Organic Acids
Acting as an overview from the General Chemistry Virtual Textbook, this site explores a variety of organic acids including acetic acid, formic acid, oxalic acid, lactic acid, citric acid, ascorbic acid, and more.
Wyzant
Wyzant: Acids and Bases
This site presents everything you need to know about acids and bases and more! Gives a nice description on what acids and bases are, properties of both, strong and weak acids and bases, an overview of pH, and much more.
Wolfram Research
Wolfram Science World: Organic Chemistry
This site from ScienceWorld provides a brief look at some of the more common organic functional groups. The carboxylic acid group is also given. Quite a few links are provided at the bottom of the page for additional information.
Other
Chemguide: Organic Acids and Bases Menu
Chemguide provides information on both organic acids and organic bases.