Upmf is a source-based package manager written almost completely in Scheme. The user is able to search, build, and remove packages. Since Scheme through GUILE is very extensible, the user can customize the procedures, or even exchange them with his own, if wanted. Packages are stored in their own self-contained directories and are incorporated into the filesystem with help of GNU Stow.
Evince is a document viewer for multiple document formats, such as PostScript, PDF, single page and multi-page TIFF, DVI, DjVu, and others. It features page thumbnails, printing via the GNOME or GTK+ printing frameworks, and searching within the documents. It supports the displaying of PDF indexes, the displaying and editing of PDF annotations, and the viewing of encrypted PDF documents.