This is Eddie Saudrais's font esint10 in Adobe Type 1 format. The Adobe Type 1 implementation was generated from the original MetaFont using mftrace. This distribution does not contain the TFM files that are necessary to use the fonts with TeX; the TFM files can be generated from the Metafont sources obtained by following the instructions in the normal way.

The author is Martti Nikunen.