Hi all,
I'm a strong adopter of slack and I really like it. I've
used it since it came out with Duchess (we started with an
internal use for the team, and we have a community slack now
with more that 150 people there that is little by little
replacing our google group). I've use it in different
communities, startups and big company client's teams. As far
as I know, other open-source projects have already adopted it
successfully.
What is cool about it is that joining any team and
switching from one team to another is very easy. If people
want to join the community, and they are already using slack,
is very easy.
I agree with Sanne, being able to use it from the
smartphone is important and could be considered as a high
requirement. I use slack on my phone, and it helps quit a lot.
Most of the time I use it from my laptop, but there are cases
where mobile has really helped us (specially in Duchess France
slack). I use the native slack client on my mac and works very
well.
I haven't tested Stride or Gitter.
Katia