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Super simple PDF invoicing. InvoicePrinter is a server, command line program and pure Ruby library to generate PDF invoices in no time. You can use Ruby or JSON as the invoice representation to build the final PDF.
ctioga2 is a plotting program in the spirit of gnuplot. It can be used either directly on command-line or writing command files (or a mix of both). It produces publication-quality PDF files. It is based on the Tioga plotting library.