diff --git a/git-tools/setup_github_network.php b/git-tools/setup_github_network.php
new file mode 100644
index 0000000000..08e99e2f32
--- /dev/null
+++ b/git-tools/setup_github_network.php
@@ -0,0 +1,215 @@
+<?php
+/**
+*
+* @package phpBB3
+* @copyright (c) 2011 phpBB Group
+* @license http://opensource.org/licenses/gpl-license.php GNU Public License
+*
+*/
+
+function show_usage()
+{
+	$filename = basename(__FILE__);
+
+	echo "$filename adds repositories of a github network as remotes to a local git repository.\n";
+	echo "\n";
+
+	echo "Usage: php $filename -s collaborators|organisation|contributors|network [OPTIONS]\n";
+	echo "\n";
+
+	echo "Scopes:\n";
+	echo "  collaborators                 Repositories of people who have push access to the specified repository\n";
+	echo "  contributors                  Repositories of people who have contributed to the specified repository\n";
+	echo "  organisation                  Repositories of members of the organisation at github\n";
+	echo "  network                       All repositories of the whole github network\n";
+	echo "\n";
+
+	echo "Options:\n";
+	echo " -s scope                       See description above (mandatory)\n";
+	echo " -u github_username             Overwrites the github username (optional)\n";
+	echo " -r repository_name             Overwrites the repository name (optional)\n";
+	echo " -m your_github_username        Sets up ssh:// instead of git:// for pushable repositories (optional)\n";
+	echo " -d                             Outputs the commands instead of running them (optional)\n";
+
+	exit(1);
+}
+
+// Handle arguments
+$opts = getopt('s:u:r:m:d');
+
+if (empty($opts))
+{
+	show_usage();
+}
+
+$scope			= get_arg($opts, 's', '');
+$username		= get_arg($opts, 'u', 'phpbb');
+$repository 	= get_arg($opts, 'r', 'phpbb3');
+$developer		= get_arg($opts, 'm', '');
+$dry_run		= !get_arg($opts, 'd', true);
+run(null, $dry_run);
+
+// Get some basic data
+$network		= get_network($username, $repository);
+$collaborators	= get_collaborators($username, $repository);
+
+switch ($scope)
+{
+	case 'collaborators':
+		$remotes = array_intersect_key($network, $collaborators);
+	break;
+
+	case 'organisation':
+		$remotes = array_intersect_key($network, get_organisation_members($username));
+	break;
+
+	case 'contributors':
+		$remotes = array_intersect_key($network, get_contributors($username, $repository));
+	break;
+
+	case 'network':
+		$remotes = $network;
+	break;
+
+	default:
+		show_usage();
+}
+
+if (file_exists('.git'))
+{
+	add_remote($username, $repository, isset($collaborators[$developer]));
+}
+else
+{
+	clone_repository($username, $repository, isset($collaborators[$developer]));
+}
+
+// Add private security repository for developers
+if ($username == 'phpbb' && $repository == 'phpbb3' && isset($collaborators[$developer]))
+{
+	run("git remote add $username-security " . get_repository_url($username, "$repository-security", true));
+}
+
+// Skip blessed repository.
+unset($remotes[$username]);
+
+foreach ($remotes as $remote)
+{
+	add_remote($remote['username'], $remote['repository'], $remote['username'] == $developer);
+}
+
+run('git remote update');
+
+function clone_repository($username, $repository, $pushable = false)
+{
+	$url = get_repository_url($username, $repository, false);
+	run("git clone $url ./ --origin $username");
+
+	if ($pushable)
+	{
+		$ssh_url = get_repository_url($username, $repository, true);
+		run("git remote set-url --push $username $ssh_url");
+	}
+}
+
+function add_remote($username, $repository, $pushable = false)
+{
+	$url = get_repository_url($username, $repository, false);
+	run("git remote add $username $url");
+
+	if ($pushable)
+	{
+		$ssh_url = get_repository_url($username, $repository, true);
+		run("git remote set-url --push $username $ssh_url");
+	}
+}
+
+function get_repository_url($username, $repository, $ssh = false)
+{
+	$url_base = ($ssh) ? 'git@github.com:' : 'git://github.com/';
+
+	return $url_base . $username . '/' . $repository . '.git';
+}
+
+function api_request($query)
+{
+	return json_decode(file_get_contents("http://github.com/api/v2/json/$query"));
+}
+
+function get_contributors($username, $repository)
+{
+	$request = api_request("repos/show/$username/$repository/contributors");
+
+	$usernames = array();
+	foreach ($request->contributors as $contributor)
+	{
+		$usernames[$contributor->login] = $contributor->login;
+	}
+
+	return $usernames;
+}
+
+function get_organisation_members($username)
+{
+	$request = api_request("organizations/$username/public_members");
+
+	$usernames = array();
+	foreach ($request->users as $member)
+	{
+		$usernames[$member->login] = $member->login;
+	}
+
+	return $usernames;
+}
+
+function get_collaborators($username, $repository)
+{
+	$request = api_request("repos/show/$username/$repository/collaborators");
+
+	$usernames = array();
+	foreach ($request->collaborators as $collaborator)
+	{
+		$usernames[$collaborator] = $collaborator;
+	}
+
+	return $usernames;
+}
+
+function get_network($username, $repository)
+{
+	$request = api_request("repos/show/$username/$repository/network");
+
+	$usernames = array();
+	foreach ($request->network as $network)
+	{
+		$usernames[$network->owner] = array(
+			'username'		=> $network->owner,
+			'repository'	=> $network->name,
+		);
+	}
+
+	return $usernames;
+}
+
+function get_arg($array, $index, $default)
+{
+	return isset($array[$index]) ? $array[$index] : $default;
+}
+
+function run($cmd, $dry = false)
+{
+	static $dry_run;
+
+	if (is_null($cmd))
+	{
+		$dry_run = $dry;
+	}
+	else if (!empty($dry_run))
+	{
+		echo "$cmd\n";
+	}
+	else
+	{
+		passthru(escapeshellcmd($cmd));
+	}
+}