Nova launcher, easy to use, more than enough features, fast response, has a builtin backup feature to save your homescreens.
Textra after trying its' big brother GO SMS PRO, and many others.
SwiftKey for a long while, then went back to the stock keyboard and turned Swipe off
Bluemail because it mimics a desktop so closely, is fast, reliable, supports folders.
turned off all of the bloatware that is not standard Android features. S-Health, etc...
turned off all of the animations, motion gestures, wave sense. Adds more gimmicks and unneeded overhead slowing down the cpu.
Tried 4 other cameras, then after all the fanfare had been waded thru, went back to the stock camera. No camera can match its' overall feature set.
added a 64 gB extSDcard by Samsung class 10
Super Backup, allows you to save backups of all of your data anywhere you choose.
See the first line of my signature..... get
MyPhoneExplorer now, not later, but now. if your screen breaks and you can't access the lockscreen, this app will save your data as of the very last minute you use the phone.
And another super neat "must have" app,
AT&T Mobile Transfer. This app will let you transfer your data to/from any phone regardless of what it is, Android or iPhone. It has become a new solid recommended staple in my list of "must have apps".
* AT&T Mobile Transfer - Simply works well