任何付費 SaaS 都有相對應的字架或開源方案
Notion -> Appflowy
Zoom -> Jitsi
Jira -> Plane
Airtable -> NocoDB
Vercel -> Coolify
Heroku -> Dokku
Firebase -> Pocketbase/Appwrite/Convex/Supabase
Shopify -> Prestashop
GitHub -> GitLab
Slack -> Mattermost
Salesforce CRM -> ERPNext
Dropbox -> NextCloud
Mailchimp -> Mautic
Trello -> Wekan
Docusign -> Docuseal
Calendly -> Cal dot com
Datadog -> Prometheus
Google Analytics -> Matomo
Microsoft Office 365 -> LibreOffice
Asana -> OpenProject
你還知道哪些？