[Samsung Gear S2] KubixRevan:
Hey all. I found on another forum a very good idea from the user tstreete - the list of apps for Your phone, that are compatible with the smartwatch.

What exactly does it mean? That You can see notifications, respond, see some info etc. So basically everything that would interact with our Gear S2 watch.

If You know about more apps please do share with us ;)

I've divided everything into 6 sections:

Message & Mail

Gmail (notifications, read, reply, show on phone, delete)

GO SMS (Read and Reply)

Inbox (can't reply on the S2)

Messages (read and respond)

Nine - Exchange email app

Textra (can respond on the S2!)

Type Mail (reply, show on phone, etc)

QKSMS (reply, show on phone, etc.)

Music & Movies

Apple Music (volume, pause, next/previous track)

BubbleUPnP - only for Audio(pause and skip, no volume when playing on other device than local renderer)

Doubletwist (volume, pause, next/previous track)

GoneMAD Music Player (compatible)

Google Music (works with the music controls on the S2)

Media Monkey

My Music Cloud (choose the song from Album/Artist/Playlist lists; control the volume; play directly from internet to headset)

Samsung Milk Music

Spotify (volume, pause, next/previous track)

Tidal (works fine with the music player)

TuneIn Radio (works fine)

Navigation and places

Citymapper ("get off soon at stop X" notification)

Gear Navigator (a navigation app with watch app and companion app on phone, can show the way on the GearS2 using Google Maps data + fine notification system with vibrations, as 2 times for 'turn left' or 3 times for 'turn right')

HERE maps (turn by turn directions)

Komoot (sport navigation app; app for watch needs android app on phone)

Roadify Transit

Yelp

Others

Calendar

CNN (Breaking News updates)

ESPN (Requested notifications of the phone app side work very well)

Filesmaster (the file manager app from GearS; installed on the phone will let You send files to the watch by 'share it'; on the watch You can manage the files + check the current memory and processor usage).

Google Now (notifications of top card; clicking on an address in an event loads google maps on phone)

Google Wallet (Notifications only?)

My Notes (You can create notes on phone and sync with GearS2 to read it; also You can create and edit them on the smartwatch with standard keyboard)

Social

BBM (notification, reply)

Britix24 (notifications, read and anwser messages and comments)

Fenix (Twitter client, see notification + respond with Tweet)

Google + (Requested notifications)

Hangouts (installing the Android wear app from the play store allows you to reply to Hangout)

Messenger (communicator for Facebook, both check the notification and reply)

Periscope (Notifications Only)

Telegram (Read, reply works fine)

Skype (messages - read, reply)

Swarm (notifiaction, like; comment only on the phone)

WhatsApp (read, reply, also group chats)

Sport

S Health (from Samsung): heart rate monitoring, workouts (step count, running, walking, cycling, hiking, elliptical, stationary bike, step machine). No sleep monitoring, yet.

Nike Running (running - heart rate monitoring, distance, map with current location, music control, notification feedback from other users)

Edit (2015-12-15):

List updated. Thanks [MENTION=5918780]straylight23[/MENTION], [MENTION=4333921]Firetribe[/MENTION], [MENTION=7125955]rgburress[/MENTION], [MENTION=1479466]CASz[/MENTION], [MENTION=6905437]Willyman[/MENTION] and [MENTION=2694198]mjsheldon4[/MENTION], [MENTION=2945938]xraytedjim[/MENTION], [MENTION=2640603]Joel821[/MENTION], [MENTION=230430]kta[/MENTION] for Your input ;)