DoXFS (pron. docs-eff-ess) is a document management system that uses the XFS filesystem to store both content (files) and meta-data (file attributes), bypassing the traditional architecture of filesystem and database, and leveraging the built-in advantages of XFS. Currently, it offers a Web frontend based on PHP and standard management functionality (create, delete, attributes add/delete, etc.) as well as extras such as versioning and Full Text Indexing (using Namazu).
img2pdf is a simple commandline utility to convert a list of PNG, TIFF, or JPEG images to a single PDF document, one image per page. It was designed specifically to convert scanned pages to PDF format, but it will accept images of any aspect ratio and scale them to full page size (which, in general, will not maintain the aspect ratio). The hard work is performed by the Panda PDF library and its dependencies.