Organising your digital assets
Eagle helps you manage pictures, screenshots, and designs that make your lightbulb shine.
Eagle is an application made for designers to manage their inspirations and the many images they usually keep, its just like a image version of Evernote! In Eagle, we can use folders, tags, colors and many other factors to manage, categorize and sort our images. Of course, when in need of these images, you may use the powerful search engine to easily locate your desired image in split seconds. It now supports Mac and Windows operating systems.
more detail here