Georgia Tech Linear Algebra Site - Online resources relevant to all courses that include linear algebra content. - http://www.math.gatech.edu/~bourbaki/linalg/
Elementary Linear Algebra - Online Lecture Notes (PostScript) by Keith Matthews, 1991. - http://www.numbertheory.org/book/
Professor Strang's Linear Algebra Class - Offers online video lectures for MIT's Linear Algebra course. Topics include geometric properties, using matrices, permutations, pivot variables, subspaces, Cramer's Rule, and Eigenvalues. - http://web.mit.edu/18.06/www/Video/video-fall-99.html
Topics in Linear Algebra - An approach unifying the notions of system of equations, matrix inversion, and linear programming. - http://home.ubalt.edu/ntsbarsh/opre640a/partXII.htm
Linear Algebra Textbook - By Jim Hefferon. Free download in PDF and TeX source code. Covers the material of an undergraduate first linear algebra course. - http://joshua.smcvt.edu/linearalgebra/
Linear Algebra from MathWorld - Offers elementary definitions in general linear algebra, matrices and determinants. - http://mathworld.wolfram.com/topics/LinearAlgebra.html
Linear Algebra Glossary - Includes definitions and examples of all basic concepts. - http://www.psc.edu/~burkardt/papers/linear_glossary.html
Lyryx Interactive Linear Algebra - Contains narrated and animated lessons, interactive exploration and computational tools, and an assessment system providing feedback to guide student learning. - http://lila.lyryx.com/
Matrix Multiplication - An interactive micro-course for beginners, by Hans Lundmark. (Uses JavaScript.) - http://www.mai.liu.se/~halun/matrix/matrix.html
Linear Algebra Toolkit - Step by step solutions of problems such as Gauss-Jordan reduction, calculating the determinant, and finding a basis of a space spanned by given vectors. - http://www.math.odu.edu/~bogacki/lat
Abstract Linear Spaces - From the History of Mathematics project. - http://www-groups.dcs.st-and.ac.uk/~history/HistTopics/Abstract_linear_spaces.html
Linear and Multilinear Algebra - Includes information on subscription, paper submission, and table of contents. - http://www.csun.edu/~hcmth042/
Linear and Multilinear Algebra, Matrix Theory - An informative description of the subject of linear algebra and all of its subfields from the Mathematical Atlas. - http://www.math.niu.edu/~rusin/known-math/index/15-XX.html
Linalg.org - Exact linear algebra computation tools and downloads. - http://www.linalg.org/
Notes on Linear Algebra - By Lee Lady: available in PDF, PS or DVI. - http://www.math.hawaii.edu/~lee/linear/