linen.dev
Lightweight Google-searchable Slack alternative for Communities
...It syncs public community threads into an SEO-friendly website so users can discover answers without joining or logging in. The project is designed to reduce repeated questions by turning community conversations into persistent knowledge pages. It can also support branded community pages, custom domains, redirects, and public discovery for paid deployments. Linen focuses on preserving useful public discussion while limiting the amount of private member information it stores. It is a strong fit for developer communities, open-source projects, and support-heavy groups that want chat content to become long-term documentation.