We have recently installed the DragMath equation editor in moodle.oxy. DragMath allows faculty and students to create sophisticated mathematical and scientific expressions using a graphical drag-and-drop editor.
DragMath is integrated with Moodle through a new button on the
rich-text editor toolbar. As a result, the DragMath editor is
available everywhere you need to enter text in a course. DragMath
conveniently creates notation for the end-user that Moodle can
translate into high-quality image files.
To learn more about DragMath, please visit http://docs.moodle.org/en/DragMath_equation_editor