Erlang/JS web-application development Stack.
Frontend test system.
Storage for relational data
Very nice programming language, used for backend integration.
Application/http-server for everything except static data.
Webserver for static data.
The one and only version control system.
'The' editor for erlang/otp-systems, integrates niceley with git.
Client Framework, integrates niceley with d3 and websockets, if you know how...
Storage for geo data.
Drawing of diagrams and maps.
I won't write pure css anymore, after getting to know this nice preprocessor.
Nice templating system, but lacks proper namespacing for non-html / xml data.
Storage for unstructured, linked and timeseries data.
The place for non-puiblic repositories. I appreciate their nice user interface and pricing model.
I use node.js mainly for backend-utility and data management scripts.
General communications. Almost everyone has skype, or at least knows how to use it...