I came across Samepage by accident as I've tried to find a software tool to coordinate an ad hoc team, working basically in different organizations.
I needed communication and work management with the inclusion of technical diagrams of some degree of sophistication and after a few tries on different software I thought I could give it a go.
As the team used the features, it became more central to our practice and communication - almost a point of reference where everyone would have an equal say, and report without interruptions. Schemas and diagrams where updated gradually and communicated with everyone in the team smoothly.
In many respects Samepage exceeded my expectation, to the point that I will use it as my default choice on my next project. Review collected by and hosted on G2.com.