WP Call to Action Widget (wp-call-to-action-widget) free WordPress plugin

A Call to Action WordPress plugin that lets you place your CTAs within posts, pages and widget areas

Requirements: WordPress 4.0+, PHP5.3 and higher

You can’t afford readers missing your CTAs. Place them at all the prominent areas within your site with WP Call to Action. You can add it to posts, pages and widget areas. You can add image, tile, subtitle, button. Choose between button type.

This plugin is free to use and is not actively supported by the author, but will be monitored for serious bugs that may need corrections.