I'm a part of a ton of Slack communities but I'm active in only a handful.
Slack works to its fullest only when it is implemented in a team and everyone's supposed to use it for communication. Slack could/should improve on making the communities on it better by adding relevant features.
As a remote designer, this is a must have. I'm always contactable and available. Super easy way to also have quick calls and communicate with other team members on different teams.
- I know you're probably looking for a more specialized solution. But I've found for building communities around "real places" - FB Groups works incredibly well. Everyone is already on it, so there's no friction to get them to join & start participating.
- @employeechannel Mobile apps for #EmployeeEngagement and communication. Extend your reach to all employees—anytime, anywhere. The app is especially designed for working communities. It does not require your reliance on Facebook in anyway. The app is literally designed around the employee life-cycle and all of it's features are very powerful. I suggest you at least request a demo.