The original PDF files came from the below links. Not published by me.

• The Architecture of Open Source Applications

  • http://aosabook.org/en/index.html

• The Architecture of Open Source Applications Volume 1 and Volume 2

  • https://github.com/aosabook/aosabook
  • https://github.com/gxcsoccer/PDisk

• 500 Lines or Less

  • https://github.com/aosabook/500lines
  • https://github.com/strump/500lines-pdf

• The Performance of Open Source Applications

  • https://archive.org/details/perfosa

• Software Design by Example

  • The PDF files were created by the sdx_html_to_pdf.py script, which scrapes a webpage and converts the HTML to PDF.
  • A Tool-Based Introduction with Python: https://third-bit.com/sdxpy/
  • A Tool-Based Introduction with JavaScript: https://third-bit.com/sdxjs/