Chris Allen

Poodle Plugins

This plugin makes it easy to distinguish between your local development site, and your live site. 
I created this because I often use a local duplicate of my live site, for development, with the same DB, and the same URL.
I needed a quick & easy way of distinguishing between my live and development sites at a glance. This plugin acheives that in the simplest way possible.
There are settings for colour, positioning and the text displayed on the badge. It is also possible to add a link onto the badge.

WP Dev Flag

Shows a floating badge on the front end, to visually distinguish your development site from production.

Dave Jesch

Steveorevo

DesktopServer for WordPress eases localhost to live server deployment by publishing hosting provider server details via a protected XML-RPC feed and API to an authorized administrator only. It also provides assisted deployments to hosting providers that support file system direct.

DesktopServer for WordPress

Great service to quickly deploy a dev site to a live server. 

WP Dev Flag vs DesktopServer for WordPress