CHRS Interactive

Theme & Extension Downloader is a simple utility plugin that allows WordPress administrators to download any installed plugin or theme as a ZIP file. Perfect for creating backups, migrating extensions between sites, or sharing custom plugins/themes.
Key Features:
<ul>
<li>Download any installed plugin as a ZIP file</li>
<li>Download any installed theme as a ZIP file</li>
<li>Bulk download multiple items in a single ZIP bundle</li>
<li>See active/inactive status at a glance</li>
<li>Seamless admin integration under Plugins and Appearance menus</li>
<li>Secure – admin-only with nonce verification</li>
</ul>
Use Cases:
<ul>
<li>Create quick backups before updating plugins</li>
<li>Migrate custom plugins to staging sites</li>
<li>Share custom-developed themes with clients</li>
<li>Archive plugins you want to keep for later</li>
</ul>
Simple & Lightweight:
This plugin does one thing and does it well. No bloat, no upsells, no tracking. Just a clean, simple interface for downloading your extensions.

Theme & Extension Downloader

Download any installed plugin or theme as a ZIP file directly from your WordPress dashboard.

flashpixx

This plugin is not be in developing anymore, all functionality is moved to a new plugin <a href="https://wordpress.org/extend/plugins/repositoryzip/" rel="ugc">Repository Zip</a>
The plugin creates zip download links within articles and pages of a subversion repository. On each call the subversion revision number, link text, css name and download 
name can be set, so that each link points to different subversion. The plugin need no configuration or something else.

SVN Zip

With this plugin a zip download link of a subversion repository can be created within blog articles and pages

Theme & Extension Downloader vs SVN Zip