Huge variety of interactive English grammar, listening and reading exercises and lessons. Free e-learning software downloads.
http://www.parapal-online.co.uk/parapal_demos.html has a suite of free software. The HotSpot task is great and can be SCORMed. The spelling feature that comes part of it is super for reinforcing key terms.
The http://www.parapal-online.co.uk/learning/demos/punctuation_scorm.zip is a template you can use to create really clever punctuation tasks that are also SCORMed. Show them to your English department and get them to suggest ideas.
Try the exercises out at http://www.parapal-online.co.uk/exercises/