How can I extract values from a raster by points?
I prefer not in Arcgis.
I prefer in Qgis or Mapwindow or other open source gis.
Answer
QGIS "Point Sampling Tool" should be the plugin you're looking for.
Here's a detailed description of how to use it: http://pvanb.wordpress.com/2010/02/15/sampling-raster-values-at-point-locations-in-qgis/
Update based on Paolo's comment:
the plugin is not the only solution, and not always the easiest solution anymore. An alternative solution is the Saga function ‘Add raster values to point’ in the processing toolbox. See for details http://pvanb.wordpress.com/2014/07/01/sampling-raster-values-at-point-locations-in-qgis-an-update/
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