Chiral Publishing
Chiral Publishing: An Introduction to Chemistry: Bronsted Lowry Acids and Bases: Audio Book
Listen and learn as you discover definitions for acid, base, and acid-base reaction. View example formulas of Arrhenius and Bronsted-Lowry acid and bases.
Simon Fraser University
Chem1 Virtual Textbook: Proton Donors and Acceptors
Acting as an overview from the General Chemistry Virtual Textbook, this site explores proton donors and related subjects including Bronsted acids and bases and Hydronium ions.
Shodor Education Foundation
Shodor: Acid Base Chemistry
This Shodor Education Foundation page has a nice look at the major theories of acids and bases in less than one page. There are very simple defintions.