By Donald E. Knuth. Bibliographic details of the published volumes (1-3, various editions and translations) and on-line beta versions of parts of volume 4, "Combinatorial Algorithms".

Michael Sipser (PWS Publishing) Table of contents, errata.

A downloadable textbook by Herbert S. Wilf. Each chapter is available as compressed PostScript or PDF.

By Gaston H. Gonnet and Ricardo Baeza-Yates. The preface, table of contents, index and all source code of this handbook. The main goal is to make available through Internet the source code of many algorithms (in C and/or Pascal) that have been already...

A web text by Bruno R. Preiss of the University of Waterloo.

By P. Crescenzi and V. Kann; KTH Stockholm. A continuously updated version of the appendix from the book "Complexity and Approximation" (Springer, 1999).