An introduction with math and a little history intended for those having a familiarity with ordinary real numbers and algebra. Full online book on abstract algebra with emphasis on linear algebra. An unfinished book by Lee Lady. An HTML-based book by Arjeh M. Cohen, Hans Cuypers and Hans Sterk. It focuses on an algorithmic approach to algebraic structures.
Site has samples and errata.
Paul Garrett's detailed and comprehensive lecture notes in abstract algebra. Andrew Baker, University of Glasgow. Also online access to Maple software through the Web, and a Webtester which always generates different questions. A collection of links to sites with information on Macdonald polynomials. Manuscripts and Publications.