Digital Photography Review reports: [edited]
Google's Nik Collection of desktop image editing plug-ins is being offered free of charge.
Compatible with Photoshop, Lightroom and Aperture, Nik's Analog Efex Pro, Color Efex Pro, Silver Efex Pro, Viveza, HDR Efex Pro, Sharpener Pro and Dfine apps are all available as a free download from Google, a substantial savings over the previous $150 price.
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[Ed. Grey Learning has kindly made a number of previously 'paid for' training videos available free.]