Logseq is an Open-Source competitor to Obsidian and Notion.
It is more of an outliner than Obsidian is. By default it shows outlines of bullets. Also, like Roam Research it encourages your new notes to be added as part of daily pages. It also has built-in task management features.
<aside> 👌 Logseq is better for transitory uses
</aside>
Like Obsidian, it is built to work on local Markdown files. It has a benefit over Obsidian that this one is Open-Source. Therefore less susceptible to being nuked from the internet.
Like Obsidian, it supports proactive suggestions for unlinked mentions of notes.
It would work very well as a Captain’s Log for Ongoing Capture. It could be made to work as a Zettelkasten Components.
Downloading the app
https://github.com/logseq/logseq
A privacy-first, open-source knowledge base