Need advice on CMS or something like that for handling users

Hi, I am using phpBB for forums, IMP with HORDE for my mail, and phpAdmanager for my site. Love PHP, but lacvk skills in it. So, here is what I am looking for. I don't know if that app is called content management, but here is what I need. Administrator page Users add/remove Users content, allow or disallow users from seeing certain content User specific index page I would use it to have our partners see only artists that apply to their needs and only show content related to those artists. Example would be that if lets say concert company logs in, they would see pricing specific to that company, they would be able to go into artists directory and only see artists that fit their type of venue, once they go into artist page they would see content like contract samples, audio samples and etc. Does anyone know of php program that would be at least close to what I am looking for. I am working for a small company, so I can't spend any money on new software (we are just holding our jobs), so yes "free" is what I am looking for. Thanx