this part is actually a bit harder, since many communities, come and go... I do feel like those apps create their own communities, of the people who use them, but I know what you mean... this is the first one I can think of that I know is active:
@creativesteem - "Creative Community Collective - Contest Central & Steemian Artist Promotion - Exclusive Reward Fund & Investment Initiative"
and of course slothicorn :) which is similar to creativesteem, but specifically for cryptocurrency related art in the creative commons.
There is the writers block, which is a community of professional writers, or writers apiring to be professional writers. They have mentoring, workshops, and peer review processes. https://discord.gg/WRdJBQT
There is the You Are Hope community, which is quite possibly the most successful charity initiative on steem https://discord.gg/hWDRQUY
The Babel-Pond which is a collective of translators, who work within the steem comunity https://discord.gg/cjxYZkH
@cervantes connects people in the spanish speaking community... there are many discord communities... but I don't have the most current list of them at the moment, so I'm struggling with this part.
https://www.steemmakers.com/
SteemMakers is a community which focuses on uniting, helping and rewarding makers and DIYers on the Steem blockchain. You can find more info about us and how to contact us on our website
https://steemit.com/utopian-io/@jefpatat/steemmakers-bot-updated
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I would add to that Pimp Your Post Thursday which is held in the Steemit Ramble discord. Two sessions are held each Thursday (11am & 7pm EST) where the attendees can share a post and talk about their post on voice chat.
It's an opportunity for people from across the platform to get to know others. Attendees are encouraged to check out the posts with upvotes, comments and/or resteems as they see fit.
Many connections have been made in these sessions helping people to come together to help each other out.
An announcement reminding people when PYPT is on is published usually on Thursday morning. The latest announcements which include an FAQ about how it works can be found at https://discord.gg/WGbn9xZ
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