Well, RocketChat is an Open Source project. You can install it on your own server. 
I have a version installed on a free Heroku acount.

About ConceptBoard: Ok, I'll try to find something similar but Open Source.

El dom., 1 de jul. de 2018 a la(s) 13:16, <doctormo@...400...> escribió:
Hi Marién,

We have to be careful about using new tools such as conceptboard. For
two reasons, firstly because we already use so many services and it
really hard to track the footprint of the project after a while.

And secondly Inkscape is a Free Software project, so we have a strong
preference for using Free an Open source tools where possible.
Especially in places where development happens.

Best Regards, Martin Owens

On Sun, 2018-07-01 at 09:31 -0300, Marién Soria wrote:
> Hi everyone!
> I'm very active this weekend. Sorry about it!
>
> Mihaela:
> Gitlab is great for collaborate with code but it's not for graphic
> design process.
>
> I have find and interesting app that can help us, it has an unlimited
> free plan.
> We can share mockups and leave feedback. It has 3 differents role
> types and you can see files like a guest. Take a look to an example
> board that I create for testing.
> https://app.conceptboard.com/board/58go-o3n8-iz3g-n7us-4roc
>
> -------
>
> Have you disscused the possibility of migrate these comunications to
> a most friendly environment like Slack or RocketChat?
> So we can use @mentions or divide conversations by topic or silence
> notifications, etc.
>
>
>
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