Nextcloud

Nextcloud is the self-hosted Google Workspace killer — file storage, calendar, contacts, document editing, video calls, and 400+ apps, all running on your server. If you care about data sovereignty or just hate paying Google $6/user/month, this is the most complete alternative.

For indie hackers with a VPS, Nextcloud Hub replaces Google Drive, Docs, Calendar, and Meet in one install. ownCloud Infinite Scale is faster but less feature-rich. Seafile is lighter for pure file sync. Google Workspace and Microsoft 365 are the commercial benchmarks.

The catch: It's AGPL-licensed, which means any modifications to the server code must be open-sourced if distributed. Self-hosting requires real sysadmin effort — PHP updates, database tuning, storage management. Performance degrades without proper caching (Redis, APCu). And the mobile apps, while functional, feel a generation behind Google's polish.