Dan Woods talks about Ratpack, an asynchronous web framework for the JVM that was inspired by the simplistic nature of Ruby's Sinatra framework.
David Pollak presents Lift's design and how the same design decisions were applied to Clojure/ClojureScript/AngularJS. Lift is a web framework with support for server-push.
Dio Synodinos explains and demoes HTML5 visualization tools and frameworks: CSS3, SVG, Canvas, WebGL, Raphaël, Processing.js, D3.js, Fabric.js, etc.
Sadek Drobi presents the architecture of the Play2 framework, a framework helping developers creating web applications in Java and Scala.
Guillaume Bort and Sadek Drobi introduce Play, a Java and Scala web development framework, insisting on its asynchronous reactive capabilities built on Iteratee IO.
Trotter Cashion introduces and demoes Chloe, a web server that handles real time data streaming between browsers and web applications written in any language and using any framework.
James Williams explains how to create and manage Ratpack (a micro Groovy web framework) applications, and dealing with authentication, persistence and interfacing Grails apps.