QuickOpen is a plugin designed to quickly open any file in the current directory by just typing in a few characters of the filename you want to open. It's similar to CommandT for Vim (https://wincent.com/products/command-t) and TextMate's (http://macromates.com/) quick open ability. Unlike the FastOpen and OpenIt jEdit plugins, it does not use jEdit's ProjectViewer plugin or require you to configure a source path; instead it allows quick opening of the files, including those in the subdirectories, in the currently selected directory in jEdit's file browser.
These details are provided for information only. No information here is legal advice and should not be used as such.