Online LaTeX Compilers and plugins for PowerPoint

• LaTeX servlet on sciencesoft.at
• LaTeX online-compiler in Halle
• MonkeyTeX
• verbosus
• LaTeX Lab
• Web LaTeX
• mathurl.com equation compiler
• LaTeX equation editor with realtime rendering
• MathTran for mathematics in TeX-notation
• sitmo equation editor with realtime rendering
• TeXify based on mimeTeX
• LaTeX2PNG
• LaTeX Generator - choose settings and let the site generate the LaTeX frame document for you 
• DeTeXify, draw a symbol and get the corresponding LaTeX command
• Codecogs, generate LaTeX to image (svg, png, pdf, etc.)
• ScienceSoft,  convert LaTeX (pronounced "Lah-tek" or "Lej-tek") documents into a PNG-image
• LaTeX Equation Editor  LaTeX Equation Editor provides you with a simple editing window in which to type your equation, and it will interactively generate a preview of what that equation looks like. 
• Hamline University Physics Department Latex Equation Editor – An on-line equation editor.
• KLaTeX Formula  KLatexFormula is an easy-to-use graphical application for generating images (that you can drag and drop, copy and paste or save to disk) from LaTeX equations.
• Iguana TeX  IguanaTex is a PowerPoint plug-in which allows you to insert LaTeX equations into your PowerPoint presentation. It is distributed completely for free.
• Laeqed (lā'kĕd') is a LaTeX equation editor specifically targeted at producing PNG images of math equations for use on web pages. It runs wherever Java and LaTeX runs, i.e. Linux, Windows, Mac... Laeqed stores the LaTeX equation into the PNG image, so it can be reopened later for further editing.