Jeff talks about the powerful features that come with Grails 2 and how it can be used as a rapid application development framework. He also compares it with Rails and Django and explains how it can be combined with other components from the Spring portfolio.
Enda talks about the challenges his team faced while developing the Enyo framework. He also gives an overview of how it works and how it aims to help developers deliver apps across different devices.
Stuart Williams explains vert.x: basic idea and architecture, how it uses Java's NIO and async APIs, how it allows using various JVM languages (Groovy, JRuby, Scala, etc), the EventBus and much more.
Bob Lee explains the popularity of Java, future language features like Lambdas, DI with Guice vs. the Dagger framework, the role of Java vs. Ruby at Square, hiring at Square, security and much more.
Declan Whelan discusses Agile Coaching and the lessons learnt returning to coding as part of a new lean startup as well Agile Coach Camp, pair coaching and his role on the Agile Alliance board.
Damian Conway explains where Perl 5.x is used today and why (hint: the CPAN library repository), and what Perl 6 offers: modern OOP, an optional type system, libraries for parallelism and concurrency, and very powerful built-in tools for parsing including extensible grammars.
Stefan Tilkov explains the importance of Hypermedia in REST and how to use it, ROCA (Resource oriented client architecture), WebSockets vs polling or server sent events, and much more.
Laurent Sansonetti explains using Ruby for iOS development with RubyMotion, how Garbage Collection works in RubyMotion, the library ecosystem, the state of debugging and profiling, and much more.