ULTRA Editor [Edit files and FTP in-game!] 1.2.2

Editor is an in-game file editor and manager. With editor you can view, edit, create, delete, copy, paste and rename files and folders on your server. It allows customisation such as sorting by name or type, showing or hiding hidden files and folders, viewing extensions, size, creation date and last modified date, and much more.

Spigot page: https://www.spigotmc.org/resources/editor-edit-files-and-ftp-in-game.17497/