RefDB is a reference database and bibliography tool for SGML, XML, and LaTeX documents, sort of a Reference Manager or BibTeX for markup languages. It is portable and known to run on Linux, Free/NetBSD, OSX, Solaris, and Windows/Cygwin.
Biospha is a suite of perl scripts based on bioperl toolkit intended to help researches to manage large sequence file. With BIOSPHA you can classify each sequence according to the NCBI taxonomy. You also can get all taxonomic info from a GI or Taxid.