Add Push Notifications service
There's nothing about push notifications, which are an essential feature of many mobile apps. There's lots of 3rd party services and it's also worth adding a sub-service for apps that do push notifications themselves (like us)
EngageBay is more than a CRM, its a fully integrated marketing automation platform that's very intuitive and powerful.
It has many features: chat, push notification, email broadcast, etc... I think it is useful to include them in the services. So it can be "push notifications" and much more, I believe.