Google PDF Viewer (Lightest utility) by Google
Magnifier with Flash Light by APP2U
Contact Editor Free (For lengthy contact notes) by DMFS GMBH
https://apkpure.com/contact-editor-free/org.dmfs.android.contacts
Call Recorder (Lightest utility) by LoveKara
FiiNote (Advanced Notes Taking with pictures) by FLYABLE
Calls Blacklist (Call and text blocker) by Vlad Lee
Audio Recorder by Sony Mobile Communications
LibriVOX (free audio books) by BookDesign
Flash Light by Happy Hollow Inc.
Startup Manager by Daniel Ch.
All-in-One Toolbox: Cleaner, Booster, App Manager by AIO Software Technology Co. (Especially The Bootup Speed Up tool)
Scroll Capture for Web by Evening Labs.
Battery by MacroPinch. (just in case your phone has no battery status indicator)
Android Messages by Google (Just in case your default built-in SMS/Text Message App does not satisfy you)
Day Widget (for showing date and day only) by Techmerity Labs
Docs by Google
Drive by Google (for storing photos and documents online)
Street View by Google
Text to speech by Google
Voice by Google
Wallpapers by Google
Hangouts by Google
Magnifier+Flashlight by App2U
Google Maps
Facebook Messenger
Photo & Picture Resizer farluner apps
Screenshot Easy by Ice Cold Apps
Uber
WordPress
Yahoo Mail
Youtube
Gmail
Chrome
Xender and Shareit