An introduction to Mozilla's BrowserID authentication service which lets users sign in with email credentials managed by Mozilla, avoiding storing user passwords. Includes Sinatra example with HAML templates and JavaScript integration using navigator.id.get(), with full code available on GitHub.

An example of adding WebSocket support to Sinatra applications using em-websocket gem. Shows how to start WebSocket server alongside Sinatra, handle connections and messages for real-time bidirectional communication, enabling features like live chat or real-time updates in Sinatra apps.

An introduction to MongoMapper as an Object-Document-Mapper for MongoDB. Shows how to create model classes and use them within Sinatra applications, providing Active Record-like familiarity for database operations without the complexity of full Rails framework for micro applications.

Sinatra example using linkedin gem for OAuth authentication and LinkedIn API access. Shows helper methods for login checking, profile retrieval, and connections listing with access tokens stored in sessions, adapted from Rails example for Sinatra's micro-framework simplicity.

A Sinatra authentication example using sessions, BCrypt for password hashing with salts, and HAML templates. Demonstrates signup/login flow with in-memory user storage for prototyping, showcasing Sinatra's simplicity for building micro web apps suitable for hosting on platforms like Heroku.