I think the major project management tool is still Microsoft Project. It should be able to do all of what you ask although I don't it will do what you ask in y

I think the major project management tool is still Microsoft Project. It should be able to do all of what you ask although I don't it will do what you ask in your third bullet point unless you specifically assign extra people to tasks. However, as others have pointed out, how much a task will benefit of extra people is really something down to domain knowledge and experience and the tool is just that, a tool to help you.