BibDB: A BibTeX database manager running on Windows (DOS and 16-bit) for creating, maintaining and updating literature reference libraries, in a format which is compatible with BibTeX.
BibEdt: Open source minimal BibTeX editor for Windows. News, screen shots and SourceForge project page.
BibTexMng: Windows program for manipulating BibTeX database files. News, screenshots and download.
Pub2Bib: Free Windows program that converts PubMed (Medline) database records into different file formats, e.g. BibTeX, HTML and CSV.