Voxpop is a project mainly written in PYTHON and JAVASCRIPT, it's free.
VoxPop: NYT Community Emotion Visualizer
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Version 0.3 - 2010 - Andrew Mahon, Zeke Shore
The following commands will bootstrap and install VoxPop on instances of the following EC2 AMIs:
curl -O http://github.com/typecode/voxpop/raw/master/scripts/install/install_voxpop_64bit.command chmod +x install_voxpop_64bit.command ./install_voxpop_64bit.command