Our great sponsors
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all-in-one
📦 The official Nextcloud installation method. Provides easy deployment and maintenance with most features included in this one Nextcloud instance.
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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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WorkOS
The modern identity platform for B2B SaaS. The APIs are flexible and easy-to-use, supporting authentication, user identity, and complex enterprise features like SSO and SCIM provisioning.
Nextcloud All in One will tick most of your requirements.
Internal chat/communication
Either a built-in mail/calendar/contact server
Either a built-in mail/calendar/contact server
Either a built-in mail/calendar/contact server
Anyway, I'm sure you would have found this by using your favourite search engine. Nextcloud is pretty popular. And you'll find much more integrations on the Nextcloud app page or on /r/nextcloud.