Scribe Java is a code library that enables developers to interact with the LinkedIn OAuth API. It also supports OAuth 1.0a and 2.0 for other popular APIs, such as Facebook, Twitter, Evernote, and Vimeo.
OAuth Newbies can find it tricky initially. In this tutorial you’ll learn how to get started with OAuth 2.0 while avoiding all the fiddly parts around handling tokens. The folks over at Insomnia will show you how to authenticate an API client for the GitHub API with OAuth 2.0 and the Insomnia app.
Canadian based startup LoginRadius is a Software As A Service (SAAS) provider of social infrastructure (Social Login and Social Sharing) that is currently used by over 25,000 websites. Despite being a fairly new service (The company was founded in May 2011), LoginRadius has expanded rapidly, partly in thanks to the LoginRadius API.