10-31 [Hexo] Use theme-next-pdf plugin and hexo-theme-next (NexT) theme to download or preview PDF files in Hexo
03-23 [Awesome Ruby Gem] Use pdfkit gem to create PDFs using plain old HTML+CSS on the backend which renders HTML using Webkit
05-05 [Awesome Ruby Gem] Use poppler and imagemagick library with pdftoimage gem to convert a PDF document into images