DBI, and its DBD children, like DBD::SQLite
LWP stands for "libwww-perl", and is the standard way of talking to web pages.
WWW::Mechanize is a superset of LWP that makes HTML processing easier.
All have different styles and different capabilities.
Whatever you do,
don't use regular expressions.
HTML::Parser or one of the many classes that uses it.
Look around on http://search.cpan.org.
If you're parsing HTML so that you can extract links or images from a web page,
WWW::Mechanize which handles it for you.
See the list of Recommended XML Modules at the Perl 5 wiki.
Use Term::ANSIColor. Example wanted.
Use Term::ReadKey (http://search.cpan.org/dist/TermReadKey). It's a standard core module.
use Term::ReadKey; ReadMode('noecho'); my $passwd; my $pwcheck; print 'password: '; chomp($passwd = <STDIN>); print "\n"; print 'verify: '; chomp($pwcheck = <STDIN>); print "\n"; ReadMode('normal'); print "You entered [$passwd] and [$pwcheck]\n";