Text::Tabs performs the same job that the unix expand(1) and unexpand(1) commands do: adding or removing tabs from a document.

Text::Wrap::wrap() will reformat lines into paragraphs. All it does is break up long lines, it will not join short lines together.

Text::Fill::fill() will reformat blocks of text into paragraphs. It uses Text::Wrap::wrap() to do the work

Install them with:

perl Makefile.PL
make
make test
make install