Daniel Treadwell

This is the free version of Social Media 2 WordPress / Complete which supports multiple profiles and G+ pages, comment imports, deeper post history, filter imports by hashtags, feature images and more! <a href="http://sm2wp.com/" title="Social Media To WordPress" rel="nofollow ugc">Click here to upgrade</a>.
Social Media 2 WordPress for Google+ allows you to continuously import posts (including photos, albums, videos and links) from Google+ to your blog.
Whether you are looking to populate an otherwise quiet blog, supplement your more regular long form content, or simply focus your efforts on the Google+ platform without losing your WordPress audience. You can schedule your import, setup your template and let the plugin handle the rest.
With regular, photo, video, link and reshared posts all supported what more do you need to help solidify your online presence.
The following features are available in this version of the plugin:
<ul>
<li>Single-click sign on to authorise your Google+ Account</li>
<li>Custom import schedules to ensure that your blog is not left wanting for content</li>
<li>Complete control of how your posts are formatted with easy to use templating</li>
<li>Control over sizes of images displayed on your blog</li>
</ul>

Social Media 2 WordPress for Google+

Social Media 2 WordPress for Google+ allows you to continuously import posts (including photos, albums, videos and links) from Google+ to your blog.

WordPress.org

Convert existing categories to tags or tags to categories, selectively.

Categories to Tags Converter

Th plugin is old but still work perfectly. I have tried it on a modern install I have, with PHP7.

Works fine, with PHP 7 too

Convert existing categories to tags or tags to categories, selectively.

Social Media 2 WordPress for Google+ vs Categories to Tags Converter