Best Free Productivity App for Android

 Evernote
Evernote turns your Android device into an extension of your brain.

★ New York Times ‘Top 10 Must-Have App’, Winner: TechCrunch Crunchies, Mashable Awards and the Webbys. ★

Evernote is an easy-to-use, free app that helps you remember everything across all of the devices you use. Stay organized, save your ideas and improve productivity. Evernote lets you take notes, capture photos, create to-do lists, record voice reminders--and makes these notes completely searchable, whether you are at home, at work, or on the go.

Time Recording – Timesheet App

Timesheet manager - easy to use, highly adaptive

Manage your timesheet.

Basic functionality:
• Check in & out
• Task assignment
• Daily & detailed notes
• Overview of day, week, month
• Data export & email as CSV, HTML or XML
• Integrated backup & restore
• Google Calendar Sync (one way only, only for Pro users)
• Dropbox integration for data export, backup & restore (Pro version only)

Highly configurable, many additional features:
• Date and time formats
• Hourly rates, paid overtime
• Calendar options (first day of week and month, bi-weekly reporting)
• Target time
• Widget to display running day total
• Status bar notification when checked in
• Public services for Tasker integration
• Ad-free

Limitations:
• Smallest tracking unit is one minute
• No multiple trackers
• No mileage or expenses
• Night shift/rotating shift is supported but needs extra setup. see FAQ.
• Only one overtime rate