I'm launching ProjectOS this weekend! What features do you like to have in your Project System?

Would love to know what Project Management Tools or System you all are using right now and your favorite features about them! What kind of integrations do you use or wish you had? Do you use any asynchronous features? What about auto-messaging? Launch for Project OS is here, launch #3 of 9 for StartOS! https://www.producthunt.com/products/projectos-startos-projects-and-sprints