JabRef Java GUI frontend for managing BibTeX and other bibliographies.
Online LaTeX Equation Editor HTML LaTeX equation editor that creates graphical equations (gif, png, swf, pdf, emf). Produces code for directly embedding equations into HTML websites.
Online at: http://www.codecogs.com/latex/eqneditor.php
proTeXt MiKTeX-based distribution for Windows, download your entire MikTeX distribution as one easy installer – approx 950Megs. In includes MikTeX, GhostView,, Ghostscript and TeXnicCenter.
TeXnicCenter is a free editor (IDE) for developing LaTeX documents under Windows.
WinEdt (shareware) is a powerful and versatile text editor for Windows designed with the creation of LaTeX documents in mind.
WinShell is a free integrated development environment (IDE) for easy working with LaTeX or TeX.