After The Deadline is a project of Automattic (the creator of WordPress) which checks:

  • spelling
  • grammar
  • styles (finds complex phrases, cliches, bias-language & suggests simple ones)
  • and detects misused words (has a database of 1500 most misused words & suggestions)

The software used to come as a plugin for several projects (like WordPress, RoundCube, PHP List) but it is now open source and anybody can embed it to their own code.

Besides the artificial intelligence it already has, it is possible to add new rules & improve the application.

The project also has libraries for jQuery, Ruby & Python to make developing new plugins easier.


Demo: http://www.polishmywriting.com/