I have only a few apps in comparison to some of y'all. My favorite two:
Runtastic -- Thus far I've walked a little over 200 miles since the beginning of the year. n7Player -- An awesome mp3 player that I use everytime I walk.
For the past few years I've been using TweetCaster Pro for Android but it hasn't been updated for over a year now and as such it doesn't support recent Twitter changes (like not counting media links as part of the 140 character limit, etc.).
In the past I've also used (and purchased) Twidroyd Pro but that hasn't been updated since 2012! Plume Premium? Also purchased. Last updated 2013.
With that in mind I've re-installed the official Twitter which, admittedly, has come a long way since it's original version.
So any recommended Twitter apps or is everybody more-or-less using the official app these days?