The TeX Catalogue OnLine, Entry for index, Ctan Edition

Extended index for LaTeX including multiple indexes

This is a reimplementation of LaTeX's indexing macros to provide better support for indexing. For example, it supports multiple indexes in a single document and provides a more robust \index command. It supplies short hand notations for the \index command (^{word}) and a * variation of \index (abbreviated _{word}) that prints the word being indexed, as well as creating an index entry for it.