Does Notepad++ have a minimap feature?

The new version of NP++ (6.0) has document map feature. Go View->Document Map. Document map or minimap will appear right hand side of the editor

I am not aware of any plugin like that, but Notepad++ has a Function List plugin which lists your function on the side, which helps with navigation a little. Google "Notepad++ function list plugin" for information

If you use only one of Notepad++'s 2 frames (views) at a time, you use this hack:

1. Make the splitter between the frames vertical (if horizontal, right-click on the splitter and select Rotate to Left).
2. Right-click the tab of the file you wish to edit and select Clone to other view.
3. Click the view you wish to make the minimap and do Ctrl + Mousewheel-down until the font size is as small as possible/desired.
4. Check View > Synchronize Vertical Scrolling and optionally View > Synchronize Horizontal Scrolling.

Now scrolling either the "minimap" or normal view scrolls the other. Sadly, text selections are not replicated.