The esint package permits access to alternate integral symbols when you're using the Computer Modern fonts. In the original set, several integral symbols are missing, such as \oiint. Many of these symbols are available in other font sets (pxfonts, txfonts, etc.), but there is no good solution if you want to use Computer Modern.

The package provides Metafont source and LaTeX macro support.

See also esint-type1.

The author is Eddie Saudrais.