The Books category contains APIs for book sharing, retail, social publishing, book creation, accessibility aids, book exchanges, metadata and more. This article focuses on 53 Books APIs including Readmill API and the popular Google Books API. We list 11 Google mashups along with other Books APIs.
GitHub is not just for code anymore. There are 84 APIs in the ProgrammableWeb directory that host their documentation on the site that makes code social. That count includes the official GitHub API, of course. What's especially interesting is that hosting docs on GitHub is not just for small startups, side projects or entities with an open source ethos. There are some big companies choosing to put forward information about their API right where someone might be looking for code.
Our API directory now includes 53 feeds APIs. The newest is the App.net API. The most popular, in terms of mashups, is the Google Ajax Feeds API. We list 45 Google Ajax Feeds mashups. Below you'll find some more stats from the directory, including the entire list of feeds APIs.