Hmm, there are a handful.
Dropbox, Evernote, WhatsApp, Facebook, Facebook Messenger, Skype, Viber, FileMaster, Google Drive, an internet banking app, news apps, Solar (weather, very good), Calculator+ (way better than the original calc and it's free), a dictionary.
X-plore - File manager
Titanium Backup - Back up all your apps with it data.
MX Player - Video Player
Color Note, AnyDO
Maps With Me - off-line map
Power Amp - best audio player(only 15 days trial)
MODERATOR - Copy/pasted material from Cerberus app page deleted. Please refer to the forum rules here: http://www.frihost.com/forums/vt-13011.html
Falcon Pro - Good twitter app
Words With Friends
ES File Explorer, Google Keep, Quora, Moon+ Reader
Phone and messages, then internet browser.
Here are my lists per group.
- Asana, Todoist, Evernote, Google Keep, Merriam Webster Dictionary & Thesaurus
-MX Player, Sky.fm, Spotify, Poweramp, Soundhound
-BBC News, NYTimes, WSJ, Flipboard, time.com, Bloomberg Businessweek
-Flashlight, Clean Master, Google Goggles
CacheCleaner, Tango, Wechat, QRDroid, Offline Browser, Flipboard
I suggest that you maintain three lists for this: Android only apps, IOS only apps and apps that are available for both. Of course there are other systems, but these two are the dominant.