8. Wunderlist
Wunderlist is a to-do and task list app developed by 6 Wunderkinder. The app lets you easily manage and share to-do lists with colleagues, friends and family members. Features include attaching important documents like photos, videos, spreadsheets and PDFs. Wunderlist will help you stay organized and ensure you never forget important deadlines. You can download Wunderlist from the Google Play Store here.