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The answer is obvious) One that is designed for your projects. If you do not know where you can order high-quality and fast development of software to manage your own projects, then I recommend you pay attention to the company Workee -https://workee.net/. They are the world leaders in this area and they provide the highest quality services to their customers. I am always very pleased and surprised by Workee's prices for their services, they are really low and nice. As for the convenience of the software they develop, I think it will be the easiest to use for absolutely everyone.