Evernote
Not so lightweight but still very good for managing life especially since it has got a lot of integrations from a lot of other services.
Free plan
WebMac
Alternatives to Notion
4 tools researchers use instead of Notion. Open-source and free tools come first.
Obsidian
note-taking with zettelkasten method (linked notes)
Free plan
MacWin
Taskade
Taskade is a beautiful project management tool for both personal use and team collaborations. Taskade ships with task management and note-taking tools.
Free plan
WebMac
RoamResearch
Online note-taking with zettelkasten method (connected notes)
Paid
Web
Prices and licences change, so check each tool's site. Missing one? Suggest a tool.