Roam Research
Roam Research is a newly developing tool created by Conor White-Sullivan that focuses on creating a graph of notes instead of the traditional hierarchical system of most note-taking systems. It is largely inspired from Zettelkasten that comes along with the following features.
Backlinks which are then used for creating a graph of related topics.
A quick capture system for mobile experience.
A daily notes system, making this viable as a journal as well.
As such, Roam is a solid note-taking system that easily integrates as a personal information management system. With the Zettelkasten-inspired system, you can use it to create a wiki similar to Wikipedia (e.g., Digital gardens).
Roam is gaining popularity and more are considering to use it. However, it is closed source and (thankfully) open source alternatives like Org-roam, Logseq, and Dendron started to fill our Roam-voided hearts.