Joomla (ACL) with menu item in Joomla! 1.5 version

There's many articles I used to manage. And then, there's also many users inside many groups.

I then make a specific menu items for the articles accordingly. But here comes the case:

How to make a menu item to be shown for a specific person inside a specific group only?

Because I found there's a paid version of Community ACL. But i didn't see the opensource version that is no need to ch开发者_StackOverflow社区ange the joomla core files.

Is there anybody here knowing the way out?

I have to maintain about a half dozen Joomla1.5 sites, and have had great success with noixACL