Rob Hess C implementation of SIFT that uses OpenCV. It allows for pretty detailed parameter tweaking (eg histogram size, DoG thresholds, etc.) If you need flexibility, this is pretty good.

sift-1.1.1_20070330_win

.......................\beaver.sift

.......................\ChangeLog.txt
.......................\docs
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.......................\....\....\doxygen.css

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.......................\....\....\functions.html
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.......................\....\....\index.html
.......................\....\....\kdtree_8h.html
.......................\....\....\minpq_8h.html
.......................\....\....\sift_8h.html
.......................\....\....\structdetection__data.html
.......................\....\....\structfeature.html
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.......................\....\....\tabs.css
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.......................\....\....\utils_8h.html
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.......................\dspFeat
.......................\.......\dspFeat.ncb
.......................\.......\dspFeat.sln
.......................\.......\dspFeat.vcproj
.......................\dspfeat.c
.......................\imgfeatures.c
.......................\imgfeatures.h
.......................\kdtree.c
.......................\kdtree.h
.......................\LICENSE.txt
.......................\LICENSE.ubc.txt
.......................\match
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.......................\match.c
.......................\minpq.c
.......................\minpq.h
.......................\README.txt
.......................\sift.c
.......................\sift.h
.......................\siftFeat
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.......................\........\siftFeat.sln
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.......................\siftfeat.c
.......................\THANKS.txt
.......................\utils.c
.......................\utils.h
.......................\xform.c
.......................\xform.h

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