The best apps are exposed in showcase.genexus.com !
This is a secondary list of cases and samples, web sites and smart devices applications built with GeneXus X Evolution 2. In many cases there are links to the Knowledge Bases from which they were built too, so that you can learn by samples too.
Some of them are detailed too in genexus.com/sd. or even in showcase.genexus.com
Knowledge Base and more info: Pesobook
Knowledge Base and info: GeneXusEvents
Workforce needed: just a Rebuild All + deploy! The process involved getting the updates from the Knowledge Base, propagate the changes using change defender and update the Community Wiki KB and rebuild!
Knowledge Base: BasicInvoicing
Knowledge Base: Query Object sample (X Evolution 2)Query Object sample (X Evolution 2)