Open source, under AGPLv3.
The Frameleaf Library community edition is free software. You can read every line, run it for as long as you like, change it, and share your changes under the same licence.
No lock-in
Your originals are ordinary files on your own disks. Stop using Frameleaf and they're still there.
Nothing self-hosted is gated
Every feature that runs on your server is free. Only cloud-connected services need a subscription.
Supporter licences
A one-time server or individual licence supports development and takes 20% off Frameleaf Cloud. It unlocks nothing on your server.
$ git clone github.com/Frameleaf/frameleaf-app
License: AGPL-3.0