Create 'autostart' directory on a directory which startall.pl is on. Each app directory must have start.sh and put or link the app directory in autostart directory. If you launch startall.pl, all of the start.sh scripts are running within each 'screen' processes.

start.sh

#!/bin/sh
# An example of start.sh
./app_pkg.pl daemon -l 'http://localhost:50005'

startall.pl

#!/usr/bin/env perl 
use strict;
use warnings;
use utf8;
use File::pushd;
my @apps = <autostart/*>;

foreach my $d (@apps){
	my $dir = pushd($d);
	$d =~ m@([^/]+)$@;
	my $name = $1;
	my $res = system("screen -dmS '$name' ./start.sh");
	print "$name - $res\n";
}
sleep(1);
system("screen -list");

stopall.pl

#!/usr/bin/env perl 
use strict;
use warnings;
use utf8;
my @apps = <autostart/*>;

foreach my $d (@apps){
	$d =~ m@([^/]+)$@;
	my $name = $1;
	system("screen -S '$name' -X quit");
}
system("screen -list");