Face Book Group Invites

I am a longtime member of this forum (can't find my old account). I am also an activist so to speak. I run a few very successful and highly trafficked political facebook pages and a website. I am looking for a sort of do-it-all kind of FB bot. Where can I go to have a script developed ? I've seen some software around but the trial versions seem to be buggy and unresponsive. I realize fb is constantly changing their API. . Is there a pre-paid 3rd party hosted service which provides FB services like such ? Thank you in advanced.