Thanks for your advice. Eidos is more like a PDM tool rather than a PKM tool, but it can be used as a PKM with some extensions, just as the introduction says, it's an extensible framework.
I've used the tools you mentioned and more. None of them have a powerful table, which is one of the reasons I decided to create Eidos. Eidos can handle large amounts of data like Excel. Anytype/Outline cannot do this.
I plan to follow Obsidian's model, with the core being always free. here is some plans:
- publish service (subscription-based)
- peer-to-peer data synchronization (One-time payment, like Resilio sync)
- an extension store that benefits developers (still a rough idea in my mind)