• cite, which supports compressed, sorted lists of numerical citations, and also deals with various punctuation and other issues of representation;
  
• drftcite, which prints citation keys rather than numbers;
  
• overcite, which prints citation numbers in a superscript position; and
  
• chapterbib, which permits multiple bibliographies, one per \included file in a document.

See also natbib.

The author is Donald Arseneau.