Ninja Popups is a WordPress plugin to create popups on your website for newsletter subscriptions, social follows, recommended or related items, and more.
The Fanciest Author Box plugin on CodeCanyon is a great plugin for any website. The plugin adds an author bio, social media, and mini-portfolio of latest works. The plugin automatically adds an author bio to the beginning, end, or any part you specify of each post where you can easily link to each author’s social media profiles (Twitter, Google+, Facebook, LinkedIn, etc.). The latest posts tab of the author box also greats valuable internal links, which could increase page views and decrease the bounce rate. The plugin is easy to use (use as a widget, shortcode, or template tag) and customize to your individual needs – and because it’s so nice, you may even persuade more people to become authors!