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Zulip
Zulip server and web application. Open-source team chat that helps teams stay productive and focused.
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Mattermost
Mattermost is an open source platform for secure collaboration across the entire software development lifecycle..
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SurveyJS
Open-Source JSON Form Builder to Create Dynamic Forms Right in Your App. With SurveyJS form UI libraries, you can build and style forms in a fully-integrated drag & drop form builder, render them in your JS app, and store form submission data in any backend, inc. PHP, ASP.NET Core, and Node.js.
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To all the people asking about self-hosted alternatives, I can recommend zulip[0], and this article[1] explaining why.
[0] https://zulip.com/
[1] https://monadical.com/posts/how-to-make-remote-work-part-two...
Personally, I rather liked self-hosted versions of these:
Mattermost: https://mattermost.com/
Rocket.Chat: https://www.rocket.chat/
Nextcloud Talk: https://nextcloud.com/talk/
Out of those, Mattermost was the easiest to setup (just need PostgreSQL and a web server, in addition to the main container), however not being able to easily permanently delete instead of just archiving workspaces was awkward. Nextcloud Talk was very easy to get going if you already have Nextcloud but felt a bit barebones last I checked, whereas Rocket.Chat was overall the more pleasant option to use, although I wasn't the biggest fan of them using MongoDB for storage.
The user experience is pretty good with all of them, however in the groups that I've been a part of, ultimately nobody cared about self-hosting an instance, since most orgs just prefer Teams/Slack (or even Skype for just chatting/meetings) and most informal groups just default to Discord. Oh well.
Personally, I rather liked self-hosted versions of these:
Mattermost: https://mattermost.com/
Rocket.Chat: https://www.rocket.chat/
Nextcloud Talk: https://nextcloud.com/talk/
Out of those, Mattermost was the easiest to setup (just need PostgreSQL and a web server, in addition to the main container), however not being able to easily permanently delete instead of just archiving workspaces was awkward. Nextcloud Talk was very easy to get going if you already have Nextcloud but felt a bit barebones last I checked, whereas Rocket.Chat was overall the more pleasant option to use, although I wasn't the biggest fan of them using MongoDB for storage.
The user experience is pretty good with all of them, however in the groups that I've been a part of, ultimately nobody cared about self-hosting an instance, since most orgs just prefer Teams/Slack (or even Skype for just chatting/meetings) and most informal groups just default to Discord. Oh well.