Org-Mode

One of the main reasons I use Emacs.

It is an outlining system that allows you to fold parts of your document, hiding them from view. You can also assign statuses and dates to different headlines, meaning it works as a task manager as well. I use it for writing and also to organise my life. I can quickly capture notes and tasks.

Everything is in Plain-Text. I can quickly search through multiple documents to find what I want. I have custom statuses set up for different files, so I can see which poems I have sent to publishers and which ones need revising for example. I can quickly move the headlines and content around and export it to custom formats.. Plus, almost everything is assigned to a keyboard shortcut by default so it is fast to navigate.