BibTeX provides an easy to use means to integrate citations and bibliographies into LaTeX documents. But the user is left alone with the management of the BibTeX files. The program BibTool is intended to fill this gap. BibTool allows the manipulation of BibTeX files which goes beyond the possibilities---and intentions---of BibTeX. BibTool contains a user's manual written in LaTeX of more than 60 pages (and still growing).