 Elements of Abstract and Linear Algebra, by Edwin H. Connell  Full online book, in 4 formats: Abode Acrobat, DVI, Postscript, and gzipped Postscript. Can be read with Abode's free Acrobat Reader.
 Linear Algebra WebNotes by Dr. Mark Sapir  Complete textbook based on class notes: includes examples of how to think up proofs. Also online access to Maple software through the Web, and a Webtester which always generates different questions. However, only the prelinearalgebra Webtests are available to the public. [Requires free registration  only takes a few seconds.]
 Abstract Algebra Online  Contains many of the definitions and theorems from the area of mathematics generally called abstract algebra. Intended for undergraduate students taking an abstract algebra class at the junior/senior level, as well as for students taking their first graduate algebra course.
 Algebra Online  offers free private tutoring, live chat, and a message board, among many other features, for all levels of mathematics (not just Algebra)! [Warning: Site does not seem to be working properly]
 Algebra Review in Ten Lessons  A review of (high school) algebra in ten lessons. Written in TeX and converted to PDF.
 Algebra.Help  Online resource for students/parents/teachers, includes lessons, tutorials, and calculators.
 Finite Rank Torsion Free Modules over Dedekind Domains  An unfinished book by Lee Lady.
 Home Page of J. S. Milne  includes preprints and course notes on Group Theory, Fields and Galois Theory, Algebraic Geometry, Algebraic Number Theory,Modular Functions and Modular Forms, Elliptic Curves, Abelian Varieties, Etale Cohomology, and Class Field Theory.
 Instant solutions to math problems  This site is composed of many math "fillinforms" into which you can type the math problem you're working on. Linked to these forms is a powerful set of mathsolvers, that can instantly analyze your problem, and when possible, provide you with a stepbystep solution, all online and instantly! You don't have to wait for an email response or post your question to an electronic bulletin board and hope someone will answer it. You can get the answer to your math problem right now!
 Intro to Abstract Algebra  Paul Garrett's detailed and comprehensive lecture notes in abstract algebra.
 Math 101  Concepts of Modern Algebra. Outline of the text for an introductory Algebra course.
 SemiSimple Lie Algebras and their Representations  A book written by Robert Cahn, in Postscript.
 Solving the Quintic with Mathematica  Methods to solve algebraically several quintic equations. Though quintics cannot generally be solved in terms of finite sums of radicals, they can be solved as infinite series, for example. (Designed as an "online poster.")
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