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.
a2ping is a Unix command line utility that converts many raster image and vector graphics formats to EPS or PDF and other page description formats. Accepted input file formats are: PS (PostScript), EPS, PDF, PNG, JPEG, TIFF, PNM, BMP, GIF, LBM, XPM, PCX, and TGA. Accepted output formats are: EPS, PCL5, PDF, PDF1, PBM, PGM, PPM, PS, markedEPS, markedPS, PNG, XWD, BMP, TIFF, JPEG, GIF, and XPM. a2ping delegates the low-level work to Ghostscript (GS), pdftops, and sam2p. Only the first page of PDF and PS files are converted.
Garbure is a collection of dedicated distributions. Each distribution provides carefully selected tools for a specific target domain, and is completed with examples and documentation. The set of distributions forms an entity, but each distribution works also on its own. All elements are arranged in the same way for each distribution.