Bookry Interactive Widgets is a website offering many nice interactive widgets and services for iBooks Author-created eBooks. These widgets add some really awesome functionality to an already solid core of features offered by iBooks Author.

Here are some examples of what Bookry offers:

Quiz Builder: Adds more features and data transfer to review quizzes.

SoundCloud and YouTube: Add streaming media to keep your overall file size reduced.

Checklist: Great for chapter summaries and objective completion.

Browser, Flickr, Instagram, Twitter, etc.: Bring the web and social media inside your multi-touch books. Great for keeping content fresh and timely.

Bookry has many others that can be used for e-Learning purposes. Check out their website and see all the nice services they offer in addition to their free widgets.