The creators of WordPress Automattic (who already own Akismet, Intense Debate, Crowdsignal Polls, Gravatar, VideoPress, P2 Theme) have just added another name to their group. “After the Deadline” is a spell checker plugin that provides spell checking, style checking and grammar checking. The financial terms of the acquisition were not disclosed.
For anyone who runs a self hosted blog, you can download the plugin here. After the installation you will need an API key like for the Akismet plugin. The sign-up is just an email address and a password.