Free
Everybody loves free!
Ruby on Rails (Rails 5)
Since its initial publication in 2010, the Ruby on Rails Tutorial has been one of the leading introductions to web development. In this bestselling tutorial, you'll learn how to develop and deploy real, industrial-strength web applications with Ruby on Rails, the open-source web framework that powers top websites such as Hulu, GitHub, Shopify, and Airbnb.
Polling for data in R
Instructor Mark Niemann-Ross begins by sharing a framework for understanding the different types of high-velocity data. He then covers how to use R to acquire high-velocity data, as well as how to leverage profiling tools and optimize R code for use with high-velocity data. He wraps up by exploring how to use R to present data, including how to use Shiny'an R package that allows you to build web apps straight from R'for interactive dashboards.