Open source applications aren't subject to being shut down or acquired by large companies.
Because the software is free, you only pay for the cost of hosting the application.
You have complete and exclusive access to your data, so you can take it with you anytime you choose.
Publicly available source code means that anyone can review it for bugs, security vulnerabilities, and functionality.
Host your own open source software without having to become a sysadmin. Use the simple web interface to run apps in the cloud.
App features are never artificially restricted based on the amount you pay. All users have full access, including features like Single Sign-On (SSO).