C++ and Python are my primary languages, the ones I choose for my own projects, and the leads on my CV. I also do a fair bit of C# and Java, simply because they are so commonplace. For my current contract, C++ is the core lang, but extensions are in C#. On a previous project servers were in C++, and GUIs in Java. There's an awful lot of C# and Java out there, often in CRUD "enterprise" style systems.