The DragAndDrop plugin allows files to be opened in jEdit by simply dragging them into the text area from a file manager, desktop, or other application. Does not work on all combinations of platform/JDK.

HartMath is a computer algebra tool. Features are: Big Number Arithmetic; Symbolic Computations, Derivatives, Expands, Polynomials, Vectors, Matrices; List Functions: Append, Prepend, Map, Apply, Table; Plot Functions; Numeric Functions; Pattern Matching Rules; Pure functions

The JIndex plugin enables jEdit to show the JavaDoc API html documentation for the currently selected word, with a single key press, in a browser of your choice.

The JStandard plugin checks a buffer containing Java source code for compliance with JavaSoft's Coding standards.

The RETest plugin provides a simple, yet powerful interface for testing regular expressions.