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.

rtowebsites

MiniComposer ist a layout page builder plugin. 
You can build any layout in a 12 column grid in an intuitive and easy to use drag and drop editor.
No programming knowledge required.
Works with every theme which uses bootstrap or foundation.
You can help to develop on 
https://github.com/RTO-Websites/Wordpress-MiniComposer

MiniComposer

Build layouts with drag&drop for every page/post

Talk to Composer vs MiniComposer