avdude

This wordpress plugin allows you to create and download a backup of a plugin or your entire plugins directory. 
Very useful to use just before updating a plugin. 
Adds menu item to Plugins & Tools

Plugin Grabber

This wordpress plugin allows you to create and download a backup of a plugin or your entire plugins directory.

meloniq

Adds a ZIP file format to download translations from <a href="https://wordpress.org/plugins/glotpress/" rel="ugc">GlotPress</a>. 
This format is a ZIP archive containing the PO, MO & PHP translation files for the selected language.
<h4>Configuration</h4>
Once you have installed GP Format ZIP it is ready to use. 
It requires the PHP ZIP extension to be installed and enabled on your server.

GP Format ZIP

Adds a ZIP file format to download translations from GlotPress.

Plugin Grabber vs GP Format ZIP