Automatic Scheduling Software

Hi I need software in which i can manage all my social accounts including all the pages of my social media profiles like Facebook, Instagram & twitter. All in one place Software. I can auto post it, in which i can scheduled the posts on all at once on Facebook, twitter and Instagram, should have the option to customize the image or video or content for scheduling the posts on all platforms. Facebook , Twitter & Instagram would be the three platforms which i require in the software.