BasKet Note Pads is a free opensource notepad/scrible pad software for Linux. BasKet can be used as a manual clipboard. This means that you can drop files of all kinds inside. They can be grouped in different tabs. BasKet is very simple to use and easy to differentiate between notes by setting tags, priorities and flags.
gscan2pdf is a simple but a very efficient GUI to scan documents of multiple pages and convert them into PDFs or DjVu format. You can also import images from image files into PDF files and vice versa. gscan2pdf only takes two clicks are required to scan several pages and then save all or a selection as a PDF file, including metadata if required.