Noteplan 3 was inspired by Bullet Journals. It uses bi-directional linking to create a network of notes and tasks. Similar to Roam Research. This is another app just for Mac, iPhone, and iPad users. Noteplan 3 uses Markdown plain text files with fast CloudKit sync and integration with iCal and Reminders.
What sets Noteplan apart from rival apps using backlinks, NotePlan is optimized around daily notes and task scheduling. The Mac version has backing linking to organize your research in a networked way like the Zettelkasten method.