It's bash framework. It is using for personal purposes. It contains some useful functions for:

• array
• constant
• decor
• dir
• exception
• file
• hash
• log
• numeric
• process
• string
• time
• utils
• variable

and a few else.

It was influenced from:

• skull
• Doxygen filter for bash
• Boilerplate Shell Script Template
• Bash 3 Boilerplate

The vlkbf also contains html directory with documentation.