The Open Library is a project of the non-profit Internet Archive, whose long-term goal is to present "one web page for every book ever published." A recent release of the Open Library brought the total number of book records to over 13.4 million (including over 234,000 records with full-text for the book).
One of the most valuable resources of the english language is the dictionary. I won't get into the history of the dictionary or what it's done for literal society. I will note that incorporating inline definitions into reading apps is not the easiest thing to do. Sure, we now have eReaders like Apple's iBooks and the Amazon Kindle that have dictionary integration built in, but what about the rest of of the text-based universe?
Merriam-Webster, the household name in dictionaries, launched the Merriam-Webster Dictionary API last week. The most trusted name in dictionary/thesaurus references has decided to make its resources available to developers through the new API. Merriam-Webster is making eight different resources available via the API.