Can you share some more promising entrants? I like op's solution because it's highly customizable, but too early/ buggy to replace Notion. I was coincidentally

Can you share some more promising entrants? I like op's solution because it's highly customizable, but too early/ buggy to replace Notion. I was coincidentally looking at Anytype yesterday, but can't create my own extensions (and the database has no formula type for columns??). Curious if there's something that's been around for 1 year+ and allows me to build my own extensions?