NRelated is proud to be one of the most popular related content plugins available for WordPress. The plugin creates a good looking flyout box similar to the one available on the NYTimes.com website.
UpPrev is pretty similar to NRelated, but it’s main function is to replace the “NEXT” button on your site with a beautiful box containing info and a thumbnail of your post.
Is an old an very experienced website in the field of online marketing. They gathered info about user preferences and pieced together the perfect option for sharing the related content.
This plugin is pretty minimalist and it is perfect if you want to keep your website on a low profile and you are just interested in text and no images. Just like the others, the plugin shows a nice box containing a link to the related article and some small description of that article.
This plugin works in partnership with the SimpleReach.com website. The thing is you will benefit of using their advanced technology for displaying related content, but you will have to keep the link to Simplereach.com there.