[tushartyagi]

I second org-mode. Previously I was using OneNote but that is limited to Windows, and on Linux I need to be always online to use the web interface.

To add one more use case: I was thinking of creating flash cards and came across org-dribble which provides the entire functionality of creating and revising flash cards using Supermemo method.

When it comes to note-taking and organising, org-mode is an excellent choice.

[jsilence]

I think it is org-drill.