The number one goto tool for me is without a doubt Evernote and has been so for a long time now. I was an early adopter and I think I got a Beta account in April 2008, so next year will mark my 10th-year jubilee as an Evernote user. I'm also an Evernote Certified Consultant (EBCC) , so if you know what Evernote is, I suggest you take a peek at it right now and contact a Consultant in your own Country. I'm sure it will be extremely useful for you. How I use it I will do a special post about later on.
When I write longer stories I love working on them in Quip, I'm totally in love with the scaled-down environment with very little distractions. The settings are very simple and when I have a text finished I check it up in Grammarly. (That is if it's English) I sometimes do a second check on the online Hemmingway app.
My goto app to spell and grammar checking, I haven't got the paid one yet but for my use, it works fine with the freeware version.
When I write I use or do other things on my computer it's best to be the most effective I can be, so I use the Pomodoro technique to get as much focus and Get Things Done. I love the integration to Todoist and Evernote.
I keep track of my steps and training with Samsung Health and my Gear watch, that's is also connected to MyFitnessPal where I log all my meals. I used to have a Fitbit but for now, I use the tools at my disposal. My hope is that I one day can afford a Garmin watch to keep track of my runs and training.
I always have a pocketsized Moleskin with me when I’m out n about, you’ll never know when you will need to jot down something.