The package defines multiple level lists within one list-like environment. instead of writing

 \begin{enumerate}
  \item 1
  \begin{enumerate}
  \item 2
  \begin{enumerate}
  \item 3
  \begin{enumerate}
  \item 4
  \end{enumerate}
  \end{enumerate}
  \item 2.1
  \end{enumerate}
  \item 1.1
  \begin{enumerate}
  \item 2
  \end{enumerate}
  \end{enumerate}

this package allows you to write

\begin{enumerate}
 \item 1
 \iitem 2
 \iiitem 3
 \ivtem 4
 \iitem 2.1
 \item 1.1
 \iitem 2
\end{enumerate}

The author is Ben Vitecek. The package is Copyright © 2013 Ben Vitecek.