KFormula

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KFormula is a formula editor designed to work with the KOffice suite. It can be used to create and edit mathematical formulas that can be included in other office documents. It provides simple input facilities and supports the functionality you expect from a KOffice application.

Some of its most exciting features are:

* Easy Greek letter insertion
* Intelligent cursor movement
* Advanced syntax highlighting
* Multi-level undo support
* LaTeX export (copy and paste into a text editor)
* MathML import

Similar applications: 
OpenOffice Calc, Excel