Java IDE of choice, IntelliJ
As we are still significantly involved with Java (thanks to Magnolia!), we need a solid and intelligent environment for our developers. In this respect, Jetbrains' tools are our first choice. jetbrains.com/idea (from the Czech Republic)
In order to increase productivity, but also for the sheer fun of it, we rely entirely on IntelliJ IDEA when implementing Magnolia projects.