While working for Red Earth Design, I built Maintenance Mode with Site Build Status to give us a way to let our clients know what stage of construction their website was in.
The plugin’s features include
- Ability to add stages of construction for your website
- Ability to set stages to “Not Started”, “In Progress”, “Completed”, or “Waiting On Client”
- Customizable background
- Link to a temporary or current live site
- Ability to add custom logo
This plugin is no longer maintained, but can still be seen in the WordPress.org plugin repository.