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Taking pictures with a web cam (linux of course)...

Desktop / Graphical..

  cheese      # perhaps too simple!

  camorama

  guvcview

  QtCA

  VLC      # Media > Open Capture Device  ->
           #     Mode: Video Camera  Device: /dev/video0   -> Play
           # You can now use snapshot or record

  Kamoso      # KDE Qt version of cheese

  HasciiCam    # ascii cam!

Command line...

  webcam

  streamer -f jpeg -o webcam.jpg

  fswebcam -r 640x480 --jpeg 85 -D 1 -S 13 web-cam-shot.jpg
       # -D delay   -S skip first frames (so camera can adjust)

  uvccapture -m


Video Frame Capture

  avconv -f video4linux2 -s 640x480 -i /dev/video0 \
         -ss 0:0:2 -frames 1 /tmp/out.jpg

  ffmpeg -f video4linux2 -s 640x480 -i /dev/video0 \
         -ss 0:0:2 -frames 1 /tmp/out.jpg
      # Again the -ss is a delay to let the camera adjust

Streaming

  Webcamoid  # https://webcamoid.github.io

  ZoneMinder # video survalience  https://www.zoneminder.com/

  Motion     # motion detect and then do various actions
             # Small web server to allow remote control (incl APIs)
             # https://motion-project.github.io/

  Kerberos.io  # video survalence with motion detect (web interface)


Miscellanious

  CLight     # adjust things (like display) based on camera as a light sensor
             # for example turn of display if room light is off