After the Deadline is a WordPress plugin that adds proofreading functionality to the WordPress dashboard. Once added, the plugin will highlight grammar, style and spelling errors while you write posts. Similar to Word, errors are color coded by type and right-clicking will bring up suggestions for correction. It’s not 100% (it didn’t catch a there/their misuse I tested), but like any proofreading support, it should be a safeguard instead of a brain replacement. The plugin is only available for self-hosted WordPress blogs. The following video shows After the Deadline in action:
Note: After the Deadline is also available as a FireFox add-on.