How to make Ubuntu application integrated?

Question

I am developing an application for Ubuntu and want to make it natural and integrated into the OS. What are the available libraries, guides, and frameworks that make an application look and feel on the Ubuntu / Unity desktop? I do not mean only graphical GUI tools, but functions such as shortcuts in Unity:

Answer 1

This Ubuntu wiki page is a good place to start. It lists many tools and libraries for integrating with desktop systems.

Here are some of the important ones:

• AppIndicators are indicators that are in the tray
• Unity Lenses - Icons on the Screenshot