I use Google Keep, Drive, Calendar, Inbox/Gmail to tackle my GTD system (www.gettingthingsdone.com). I capture everything (ideas, pictures, audio, etc.) with Keep. My next action list is in Google Keep too. To sort the actions using contexts you just need to use the tags. Then from Horizon 1 up, I use Google Drive to organize (in folders) all my projects, areas of focus, goals, vision, and purpose. My digital reference material also go in Drive (but some in Evernote and Dropbox). Google Calendar and Inbox/Gmail are self-explanatory. Finally, I use the reminder feature spread across Inbox, Calendar, Keep, and Google Now to handle my tickler.