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Blob is a library for computer vision to detect connected regions in binary digital images. This is nothing but contours in opencv with some extra features like blob/contour orientation, centroid, color, Area,Mean and standard deviation of the pixel values in the covered region,etc...

I have noticed few blob libraries such as

OpenCVBlobsLib - This one looks pretty good as it got Multi core support for the extraction stage & this is well documented.

cvblob- this is old c implementation.

cvBlobLib- this is not well documented.

OpenCVBlobsLib is well documented & got some interesting features in it. You can also check each libraries & evaluate them individually. For more details read their doc!