http://www.math.niu.edu/~beachy/aaol/

Math Forum: Algebra Problem of the Week - A weekly interactive math project. You can answer challenging questions every week from the Internet.

http://mathforum.org/algpow/

Abstract Algebra - Abstract Algebra.

http://www.maths.tcd.ie/~dwilkins/Courses/311/

Lecture Notes in Algebra and Number Theory - The pdf files below contain versions of course notes that I have written over the past decade or so.

http://www.maths.gla.ac.uk/~ajb/course-notes.html

Algebra Links - Algebra links.

http://www.spartanburg2.k12.sc.us/links/algebra.htm

Algebraic Areas of Mathematics - Algebraic Areas of Mathematics.

http://www.math.niu.edu/~rusin/known-math/index/tour_alg.html

Algebra Review in Ten Lessons - A Quick Review of Algebra: Written in TeX and converted to the Adobe PDF format.

http://www.math.uakron.edu/~dpstory/mpt_home.html

Algebra Homework Help - Algebra, math homework solvers, lessons and free tutors online.

http://www.algebra.com/

Highschool Algebra - Ask Dr. Math Archives: High School Algebra.

http://mathforum.org/library/drmath/sets/high_alg_toc.html

Algebra Help - For students and parents, includes lessons, step-by-step calculators, worksheets, and other algebra resources.

http://www.algebrahelp.com/