My favorite plugin for Notepad++

Notepad++ plugin

HEX-Editor

Convert text to hexadecimal, see edit.

NppExport

Export shaded-coded files to other formats.
Export the color code to a word document (RFT) or web page (HTML) file, or copy the color code (RTF format or HTMl format) to the clipboard and paste it into another (word document, HTML web page).

CoolFormatNppPlugin

code formatting

NppAStyle

code formatting

XML Tools

XML syntax rule checking

Compare Plugin

Compare files

PyNpp

Write and run Python directly in Notepad

JSON Viewer

Json view format