What less popular text editors do you like or should have a shout out more often? What stuff do you do with it?

Geany. A real sleak, flexible and powerful editor.

You can use it to edit multiple lines simultaneously, perform extensive search/replace operations, etc.

It has plugins that can transform it from a humble notepad to a full IDE with code versioning support.

It often saves me from having to muck about with sed or awk in some tasks.