Here are the useful modules I have on my system:

• Time::HiRes
• Digest::MD5
• Net::DNS
• File::MMagic
• Compress::Zlib
• Archive::Tar
• Archive::Zip
• Term::ReadLine
• Tk
• Proc::ProcessTable
• Text::CSV_XS
• Digest::HMAC
• Net::FTP
• LWP
• Mail::Util
• Mail::Mailer
• IO::Stringy
• MIME::Decoder
• Net::HTTP
• Crypt::OTP