I have my focus on developing distributed applications (including web applications) using different techniques (although some work together in the same project I am not using all of them at once...)

• Java Enterprise
• Javascript / HTML5
• JSON or XML data exchange
• Websockets & conventional Sockets
• Databases / SQL
• C/C++

For example I have been or am using the following tools:

• Jetty webserver
• Spring framework
• Hibernate ORM
• Eclipse IDE
• Jackson JSON library
• PostgreSQL database
• Automation Studio IDE (for PLC programming)

... and I am building my own application & game development framework on top of them.