PDFjam is a small collection of shell scripts that provide a simple interface to some of the functionality of the pdfpages package for pdfLaTeX. Facilities include n-up imposition, page rotation, reflection and trimming, selection of pages, and many more. PDFjam depends on a working installation of (pdf)LaTeX, complete with the pdfpages package. For Mac OS X, some example applications (droplets) are provided for drag-and-drop access.
Scheme Note is a Scheme-like music file format and MIDI conversion tool. It takes a text file, which is a representation of a song, loosely tied to a MIDI-like event structure, and outputs a corresponding MIDI file. It is hand-editable for simple songs, and should be very easy to parse for a GUI.
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.
extendedPDF is an OpenOffice.org macro that converts an OpenOffice document into a PDF document. The output includes the original document's headings as PDF bookmarks, and includes the original hyperlinks as PDF hyperlinks. Document meta-information (such as title, author, and keywords) is also added.