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...This solver is based around the Gauss-Seidel algorithm for 2D heat transfer for pre-determined boundary conditions (i.e. user defined temperatures). I hope this project will be useful for illustrating this type of 2D heat transfer problems. This project uses jpeg2pdf open source converter by Dmitry Markin and Haohu (hosted on SourceForge as well).
Cross-platform command-line tool for creation of PDF documents from scans/photos of pages in JPEG (.jpg) format and the lightest weight ANSI C library to put multiple JPEG files into one PDF file.
You can add handwritten comments to PDF scans (over original images) with xournal: http://xournal.sourceforge.net/
It supports graphics tablets and saves comments to PDFs as vector data.