shawfactor

LH Fresh Content is the best plugin for requesting browsers to refresh their page. Perfect for single-page applications or pages that bring in feeds.
This plugins checks (in the backround) if the current page is out of date. If the current page is active the user is sent a message alerting them the page is out of date and givig them the option to refresh the page.
If the page is in the background the page is refreshed automatically.
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LH Fresh Content

LH Fresh Content checks if the page visitted is stale (or has been updated) and updates it in the background or alerts the visitor.

mbence

This plugin will automatically refresh your visitors browsers, if you save a post (or page) in your wp-admin. 
It works by checking for new posts regularly, and then reloading the browser to show the changes.
There is a chance however that this unexpected refresh could be annoying for some visitors, so use this plugin with caution!
There are no settings for this plugin at the moment, so if you activate it, it will just do it’s magic. 🙂 
You can disable it by deactivating the plugin.
If you are looking for a developer tool for instant reloads check out the big brother of this plugin: WP LivePHP: https://wordpress.org/plugins/wp-livephp/
Since v1.0.1 Formidable Forms are supported as well. A form submit will trigger a reload. In a next version I’ll make this optional.

Reload

Automatically refresh your site if you update a post

LH Fresh Content vs Reload