This LaTeX package simulates animiation in slide deck, similar to what PowerPoint can do.

First, install it from CTAN and then use in the preamble:

\documentclass{article}
\usepackage{clicks}
\begin{document}
\plick{Here is your wedding plan:}
\plick{1. Buy a ring}
\plick{2. Propose}
\plush{3. Get married}
And then live happily ever after.
\end{document}

If you want to contribute yourself, make a fork, then create a branch, then run make in the root directory. It should compile everything without errors. If not, submit an issue and wait. Otherwise, make your changes and then run make again. If the build is still clean, submit a pull request.