Repo: https://github.com/ontoplano/ontoplano
Demo: https://demo.ontoplano.com/
modular (you can deactivate features you don't want to use)
integrable (Webhooks, REST API, MCP server)
Just one place to keep all your personal organisation data, easily integrable, in case you want to do something else with this data.
It has many features beyond what Trilium (which is a primarily note-taking app) offers, such as: finance tracking, inventory management, goals & tasks with linking and priority, workout & habits logging, and especially reminders and alarms: trillium has no official mobile app, only the PWA, which can't access android alarm permissions. These are out of the top of my head.
But Trillium has more features regarding notetaking specifically, of course, some of which I intend to implement in the future. But yeah, is older and battle-tested, so I understand your decision.