Here's what I have done to setup my Nexus 6 to the way I lke it:
1. Notifyer Plus app- Gives me numerical badges for all my calls, texts and emails.
2. YouMail- Personalized call greetings.
3. Textra Text Messaging- Clean UI. I like it a lot better than Messenger.
4. SpeakerPhone Ex Pro - Turns my speaker on automatically when I make a call.
5. Zedge Ringtones- I have separate ringtones for calls, emails or texts. Allows me to listen for low priority emails but respond to texts as a higher priority.
6. Screen brightness- controlled manually
7. Battery widget- gives me % in upper left notification area.
8. Notes- Use Color Note to keep track of things. I also have Evernote which is cross platform, but I haven't used it much.
9. MySMS- use it on my MacBook Pro to send messages
10. DoubleTwist and AirSync- use it to transfer music from my Itunes library to my N6. Works really well.
11. PhotoTransfer- Wirelessly transfer photos between my MacBook Pro and N6 and vice versa.
12. Wondershare Mobile Trans- Puts a complete backup copy of my N6 on my MacBook Pro.
13. Mobile Go- keeps track of my RAM and automatically, at my command, clears RAM
1. Notifyer Plus app- Gives me numerical badges for all my calls, texts and emails.
2. YouMail- Personalized call greetings.
3. Textra Text Messaging- Clean UI. I like it a lot better than Messenger.
4. SpeakerPhone Ex Pro - Turns my speaker on automatically when I make a call.
5. Zedge Ringtones- I have separate ringtones for calls, emails or texts. Allows me to listen for low priority emails but respond to texts as a higher priority.
6. Screen brightness- controlled manually
7. Battery widget- gives me % in upper left notification area.
8. Notes- Use Color Note to keep track of things. I also have Evernote which is cross platform, but I haven't used it much.
9. MySMS- use it on my MacBook Pro to send messages
10. DoubleTwist and AirSync- use it to transfer music from my Itunes library to my N6. Works really well.
11. PhotoTransfer- Wirelessly transfer photos between my MacBook Pro and N6 and vice versa.
12. Wondershare Mobile Trans- Puts a complete backup copy of my N6 on my MacBook Pro.
13. Mobile Go- keeps track of my RAM and automatically, at my command, clears RAM