Roam Research

Roam Research is a auto-back-linked-wiki that helps people to be more productive.

With bi-directional links, you can create new pages as you type, and when you go to those pages, it lists all the bullets where you've mentioned the tag. This way you can create a network of notes that are interconnected and not linear or hierarchical

Roam helps you organize your research for the long haul. You can mix and match and use filters to do a ton of things inside it like Bullet Journaling, Project Management, Building a Second Brain, Progressive Summarization, 5 Minute Journal, etc