Spectrum is a community platform for the future. By building on Spectrum, communities become easily discoverable through search, curation, and even other community members.
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Linen
Google-Searchable and community focused Slack alternative. Linen is built for community support. Linen is designed to be familiar to existing communities while giving all the benefits of a forum.
Mattermost
Mattermost is an open source Slack alternative. It's written in Golang and React and runs as a single Linux binary with MySQL or PostgreSQL. Use the features you like (file sharing, real-time group chat and webhooks—to name a few) and access the source code.
Yellow
Edit your website in a web browser. Log in with your user account. You can use the normal navigation, make some changes and see the result immediately. It is a great way to update your website. No database, no admin panel.