llpp is a lightweight, fast and featureful PDF, EPUB, XPS and CBZ viewer based on MuPDF. It supports outline/bookmark/birdview/annotation views by one key pressed, It also supports vi-like custom key bindings by adding keymaps to achieve mouse free navigation.

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Markdown is a lightweight markup language with plain text formatting syntax. It is designed so that it can be converted to HTML and many other formats using a tool by the same name. Markdown is often used to format text files, for writing messages in online discussion forums, and to create rich text using a plain text editor.

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X.Long Kong