$ find test/perl -name '*.p[lm]' -exec grep '^use ' {} \; | cut -d' ' -f2 | perl -wle 'while(<>){ s/\s*//g; s/;//g; print}' | sort  | sort | uniq -c | sort -rn | head -50
    704 strict
    606 warnings
    186 Data::Dumper
    175 Log::Log4perl
    170 constant
    135 Getopt::Long
    123 Pod::Usage
    106 lib
     49 base
     45 fields
     39 vars
     34 Benchmark
     30 FindBin
     27 DateTime
     26 DBI
     23 Test::More
     23 File::Find
     22 Term::ANSIColor
     14 Time::HiRes
     14 Readonly
     14 Module::Install::Base
     14 Exporter
     13 Time::Local
     13 File::Copy
     13 Digest::MD5
     12 XML::Writer
     11 URI::Escape
     11 GraphViz
     10 Text::ParseWords
     10 Log::Dispatch::FileRotate
     10 JSON::XS
     10 Config
      9 Image::Imlib2
      9 Date::Calc
      8 POSIX
      8 List::Util
      8 Blog
      7 Test::MockDBI
      7 Storable
      7 Math::BigInt
      7 IPC::SysV
      7 IPC::Msg
      7 Carp
      7 Archive::Zip
      6 Test
      6 File::Spec
      6 Fcntl
      6 Date::Manip
      6 Cwd
      6 Catalyst::Test
      ...