This is a traditional, open source chemistry text book
PhET is a product of University of Colorado Boulder and provides fun, free, interactive, research-based science and mathematics simulations.
Digital Public Library of America
Basic Chemistry book, with sections focused on food chemistry and taste.
Explore natural phenomena and scientific practices with videos, lesson plans, and interactive tools.
This is a survey of General Chemistry, Organic and Biological Chemistry
This link will bring you to a resource bank generated by the American Chemical Society containing many online learning vehicles.