I am a professional Software Engineer having more than 6 years experience and I have developed more than 20 bots, I think your a requesting something similar to the attached sample application. Its called Pligg poster, it has many features and you can import pligg sites and work with, supports captcha, multi thread and many more you can see from the GUI, you can try Signup (some times may not work as sites may have down but framework is stable), and post I have removed as its a demo version, I can make this to work on browser as well as HTTP. I have many more tools like this, article submitter, rss submitter, formu poster, all in one suit etc, I am ready to sell the source code too, if you like the application , please contact me back..thanks