Who will tell you a network organizer with a certain functionality?

Question

Notifications

Good afternoon! I'm looking for such functionality in a network organizer:
1. The need to maintain common projects so that they can be changed by whoever has access to the project. Those. not exactly the one who created it and changes it, but certain users.
2. And also certain users received a reminder on the tasks in the project. As an example: there are 5 users in a common project, 1 creates a task, and sets up a notification for all users (or groups of users) so that everyone receives a notification at once.
This functionality is exactly what we need! who will tell?
Thank you!
Threat LeaderTask is not suitable. Exiland Assistant is very similar. what you need, but not what.