Stack Overflow, the very successful question and answer site for programmers, have now released their own API into public beta. The API actually works with all of the Stack Exchange sites, including serverfault.com and superuser.com, with more sites possibly launching in the future. The API is supported by the site http://stackapps.com.
SmartFile, a web-based FTP hosting and file sharing platform, has just announced the release of the new and improved Version 2 SmartFile Platform that includes many new features, a new user interface and a brand new API.
Twitter Kit 3 was introduced as a standalone SDK earlier this year. Originally limited to Android and iOS, Twitter has expanded support to Unity. Whether its login authorization, in-game Tweets, or sharing, Twitter Kit for Unity might change the gaming landscape through more social capability.