First impressions are important & a website with lots of typo may easily result in losing visitors.
Spell Check Rex is an open source website spell checking application, built with PHP & MySQL, which can be installed on any website to automatically monitor & report spelling mistakes.
The application spiders the given website and generates reports. It supports frame-enabled websites & directories, pages can be excluded.
Spell Check Rex only supports English (has a multilanguage backend) & has 110,000+ words in its database.