YoImages Search is a Wordpress plugin that allows searching and uploading royalty free photos from the web directly into the Wordpress Admin interface.
YoImages Search is part of a suite of modules which aim is to add better image handling capabilities to the Wordpress core, read more about YoImages Search.
You can get YoImages Search along with other YoImages modules here or you can install it as a stand alone Wordpress plugin following the steps described in the next paragraph.
YoImages Search is built with Composer. To install it from sources go to your Wordpress plugin directory via terminal and there:
git clone https://github.com/sirulli/yoimages-search.git
cd yoimages-search
curl -sS https://getcomposer.org/installer | php
php composer.phar install
To update your installed YoImages Search plugin from sources go to Wordpress plugin directory via terminal and there:
cd yoimages-search
git pull
php composer.phar update