The application is called "SilkEdit". It is a cross platform text editor for Windows and Mac.
- Cross Platform
It runs on both Windows and Mac.
- non-English friendly
Support many languages other than English.
- Easy to learn
Not only a developer but any other users can use it easily.
- Web-like Experience
Though installation is necessary, it behaves like a web app by updating automatically behind the scenes and syncing configuration and documents.
It keeps responsive no matter how feature rich it is.
By default the application stays in the mac menubar or windows taskbar. So the icon has to work in small sizes and also in big sizes as logo or on a webpage.
It should also reflect modern design guidelines of Windows 10 / OSX El Capitan.