I didn't know Spectrum until today. It looks similar to Gitter. As I understand it, it means we now have at least three “slack-like”, well-backed, open-source, community-centered chats: - Gitter, now owned by GitLab; - Spectrum, now owned by GitHub; - Mattermost, independent, but fully integrated within GitLab. That's great to have credible alternatives to the proprietary behemots that are Slack, Discord and others,…
I like Gitter, the Scala community is on Gitter. However I wish they'd fix their IRC bridge, which has some issues, like not reporting the full list of users, which is driving me insane. Speaking of Slack-like, the best alternative remains in my opinion good old IRC. I'm a user of https://irccloud.com for always-on presence on IRC and it has better clients than Gitter.
Gitter search UI is the worst, and search itself is useless, often returning no results when you can spend an hour scrolling to find what you want manually.
This is inexcusable when Gitter is your project's de facto Q&A place instead of more structured places like StackOverflow or Github issues.
And so the users are left with a messy stream of collective consciousness that is impossible no search or navigate effectively.