xaraartech

Abuzer

Adds functionality to search images from post page and attach as featured image. 
You will require to create an API key on bing for search API. 
GOTO: https://azure.microsoft.com/en-us/services/cognitive-services/bing-image-search-api/ or https://dev.cognitive.microsoft.com/docs/services/56b43f0ccf5ff8098cef3808/operations/571fab09dbe2d933e891028f 
And generate your “Ocp-Apim-Subscription-Key”

External featured image from bing

Adds functionality to search images from post page and attach as featured image.

Chris Huff

This plugin makes the process of publishing content more simple.
<ol>
<li>Write your blog post.</li>
<li>Spend hours searching stock photography websites online for the perfect image to go with your blog post.</li>
<li>Done!</li>
</ol>
If you don’t set a featured image manually, this plugin will automatically generate an image from the post title, excerpt, or content of a new or updated post or page and set it as the featured image. The image will then be included in your theme wherever the featured image for the post or page is called for.
<a href="http://designsbychris.com/auto-featured-image-from-title/" rel="nofollow ugc">Upgrade to the PRO version for more features and control!</a>!
It’s good to have an image in every post and page that you create. It helps for things like search engine optimization, social sharing, and just the attractiveness of your blog. But sometimes it can take longer to find a good image for a particular blog post than to write the post itself.
This plugin simplifies the process of publishing content. It will automatically create a customized image for each post or page that you create. You can select a background image to match the look and feel of your blog, and the plugin will automatically write the title, excerpt, or first 55 characters of the content of a new or updated post or page on top of this background image to create a unique image for each post.
By popular demand, the plugin now has an option to simply set the featured image from the first attached image in a post, without generating a new image.

Auto Featured Image from Title

5 Stars for the idea alone

It works!

Automatically generates an image from the post title of a new or updated post and sets it as the featured image.

External featured image from bing vs Auto Featured Image from Title