Speech Trainer
Speech trainingGPL-3.0
Speedmeter
Lightweight speed meterGPL-2.0
SpiritF
Use headphones as antenna for FM radioAGPL-3.0+
Spydroid
Stream camera to desktopGPL-3.0
StageFever
Display stage notes, AMP/effect settings etcGPL-3.0+
Starke Verben
Learn your German strong verbsGPL-3.0
Starun
Follow a cute star's travelGPL-3.0
Step and Height counter
Counting Steps and Elevation gain on Nexus 5XGPL-3.0
Stocks Widget
Stock market ticker widgetMIT
Stopwatch
Stopwatch build into the notification barArtistic-2.0
Storage & USB
Launch storage settings directly from the apps drawerGPL-2.0
StreetComplete
OpenStreetMap surveyor appGPL-3.0
Stringlate
Help translating FOSS applicationsMIT
Studiportal
Check for test results at HS FurtwangenMIT
Styrkur
Track your workoutsGPL-3.0
Sudoku
Play Sudoku logic puzzleGPL-3.0
Sugarizer
Use Sugar learning platformApache-2.0
Summation
Add values from a listGPL-3.0
Suntimes
Display sunrise, sunset, and twilight timesGPL-3.0+
SuperGenPass
Implementation of SuperGenPassGPL-3.0+
Superuser
Manage root accessApache-2.0
Surespot
Send encrypted text messagesGPL-3.0
Survival Manual
Learn how to surviveGPL-3.0
Svarka Odds Calculator
Bulgarian card game odds calculatorGPL-3.0
SVG redirect
Open SVG files with your browserGPL-3.0+
Swiftnotes
Take notesApache-2.0
SwpieView
Minimalist image viewer with GIF supportGPL-3.0
Symphony
A genre and album based music playerGPL-3.0
SyncOnWifi
Synchronize accounts only on specific networksGPL-3.0
Syncopoli
An rsync client that worksGPL-3.0