GPicView is a simple and fast image viewer with low memory usage. It's aimed at replacing the default image viewer of current desktop systems. Fast startup, low memory usage, and a simple user interface make it a good choice for a default viewer. It is extremely lightweight and fast with low memory usage, has a simple and intuitive interface, minimal library dependencies (only GTK+ is used), and doesn't require any specific desktop environment. It was inspired by the Windows XP image viewer and gimmage.
The chemical-mime-data package is a collection of data files to add support for various chemical MIME types on Linux/Unix desktops, such as KDE and GNOME. Chemical MIME types were proposed in 1995, though it seems they have never been registered with IANA. But they are widely used, and the project's aim is to support these important but unofficial MIME types. Initial data was taken from "The Chemical MIME Home Page" of Henry Rzepa.