| Abstract Algebra | | Lecture notes by David Wilkins, Trinity College, Dublin. Topics in Number Theory; Group Theory; Galois Theory. |
| 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. |
| Catalogue of Algebraic Systems. | | Summary of and links to online materials concerning algebraic systems: semigroups, groups, rings, algebras, groupoids, and categories. |
| Center for Commutative Algebra | | A site for the commutative algebra community, including news, conference and preprint announcements, and a huge list of algebraists. |
| FDLIST | | Information on representation theory of finite dimensional algebras. Papers, meetings, places, people, jobs, journals, software. |
| 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. |
| Homogeneous Transformation Matrices | | Explicit n-dimensional homogeneous matrices for projection, dilation, reflection, shear, strain, rotation and other familiar transformations. |
| IDA: Algebra Interactive | | An HTML-based book by Arjeh M. Cohen, Hans Cuypers and Hans Sterk. It focuses on an algorithmic approach to algebraic structures. Many of these tools and examples use the computer algebra package GAP. Site has samples and errata. |
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