heiglandreas

This plugin adds plugins on activation to a composer.json-file and on deactivation removes them.
That way you can handle your plugins via <a href="https://getcomposer.org" rel="nofollow ugc">composer</a>.
Plugins are added to the composer.json via <a href="https://wpackagist.org" rel="nofollow ugc">wpackagist</a> which makes the wordpress-plugin-directory available via git.
But you can also manually add plugins to the pluginlist and on activation the plugin is checked for a composer.json file and if one exists the name is used to add the plugin to the composer.json-File.

Talk to Composer

Add all your active plugins to a composer.json-File.

ralerin

adaza

With this plugin you can make a newsletter with your custom template adding posts from a specified category. Then you can edit the result with a WYSIWYG editor.
The plugin will generate an HTML file saved in uploads directory.

Newsletter Composer

This plugins makes an HTML newsletter file with the category you have selected.

Talk to Composer vs Newsletter Composer