The RocketChat integration on the main RockRMS site is fantastic. Our staff team has looked at Slack for internal communications, but has held off because of expense. Spark has already done the work of packaging RocketChat into a format workable with Rock. If it was a module that we could purchase through the Rock Shop, we'd do that immediately. Proceeds could go to Spark. Given the number of churches with internal messaging needs, there could be a real market for this. Plus, Spark has already done a lot of the work.