alleqno – Automatic numbering of all equations
Redefines \[ ... \] to behave as a equation environment, and defines \[[ ... \]] to behave as an eqnarray environment.
Maybe you are interested in the following packages as well.
- eqnarray209: A fix for LaTeX 2.09 eqnarray
- geophysics: Articles for the journal Geophysics
- eqmark: Generalise facilities for marking equation arrays
- altnline: Line numbering in LaTeX 2.09