v2.0 is the first major overhaul in quite a while. Some of the bigger changes are template variables for keeping secrets out of configs, priority/escalation, smarter retries, parallel delivery, better result reporting, and authentication plus per-configuration access controls in the self-hosted Apprise API.
Apprise can be used as a Python library, CLI, or through the self-hosted API. There are currently 160 supported notification services.
Docs: https://appriseit.com/ API: https://github.com/caronc/apprise-api Release: https://github.com/caronc/apprise/releases/tag/v2.0.0
Happy to answer questions about the v2 changes or architecture.