The following module will import every module in directory Foo and export everything the submodules export, and is a potential security risk for pathological file names:

package Foo;
use strict;

BEGIN {
    my @modules = ();
    opendir DIRHANDLE, 'Foo';
    while (my $file = readdir DIRHANDLE) {
        if ($file =~ /\.pm$/) {
            $file=~s/\.pm//;
            push @modules, $file;
        }
    }
    closedir DIRHANDLE;

    require Exporter;
    our @ISA = qw(Exporter);
    our @EXPORT = ();
    for my $module (@modules) {
        eval 'use Foo::'.$module;
        {
            no strict 'refs';
            push @EXPORT, @{"Foo\:\:$module\:\:EXPORT"};
        }
    };
}

1;
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Update: Forgot to close the directory handle.