This is a list of my top Android apps:

1. SwiftKey keyboard: replaces the default keyboard and adds the “flow” feature $$
2. Sunrise calendar + DigiCal + Google Calendar*
3. Twilight: adapts the screen to the time of the day by making it red accordingly.
4. Easy Battery Saver
5. Timesheet: for time tracking
6. Wunderlist: for task management f/$$
7. Sleep as Android (unlocked): for sleep tracking and as an alarm clock $$
8. GnuCash: for bookkeeping
9. Evernote: for notetaking f/$$
10. Google Drive + Docs + Sheets: for writing on the go
11. Pocket: for reading web articles offline free of ads and distractions
12. gReader Pro: for reading feeds (integrates with Feedly) f/$$
13. Moon+ Reader Pro: for reading ebooks f/$$
14. Plume: for tweeting
15. WolframAlpha: for instant expert knowledge and computation $$
16. CamScanner: for scanning documents by taking images f/$$
17. Smart Audiobook Player f/$$
18. IFTTT
19. Link Bubble: to open links without leaving the current app. Very handy.

Legend

• f: free
• $$: paid
• not indicated: free

* DigiCal is great for its Cut/Copy and Paste feature while Sunrise calendar has a great user interface and offers (for free counter to DigiCal) the feature to add other calendars to integrate Evernote (for reminders), Facebook (for birthdays & events) and other services.