I didn't get to pick more than one option but I use google docs, grammarly, and sometime editminion.
I live in google docs because it auto saves, and it can use it on multiple devices.It's also easy to share and invite people in to view to document.
Grammarly is awesome. We don't always agree but it does help me catch the mistakes I tend to make.
Editminion will really break things down too.