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.

Packet : 61549849sift-1.1.1_20070330_win.zip filelist
sift-1.1.1_20070330_win/
sift-1.1.1_20070330_win/beaver.png
sift-1.1.1_20070330_win/beaver.sift
sift-1.1.1_20070330_win/beaver_xform.png
sift-1.1.1_20070330_win/ChangeLog.txt
sift-1.1.1_20070330_win/docs/
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sift-1.1.1_20070330_win/docs/html/index.html
sift-1.1.1_20070330_win/docs/html/kdtree_8h.html
sift-1.1.1_20070330_win/docs/html/minpq_8h.html
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sift-1.1.1_20070330_win/docs/html/structdetection__data.html
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sift-1.1.1_20070330_win/dspFeat/
sift-1.1.1_20070330_win/dspfeat.c
sift-1.1.1_20070330_win/dspFeat/dspFeat.ncb
sift-1.1.1_20070330_win/dspFeat/dspFeat.sln
sift-1.1.1_20070330_win/dspFeat/dspFeat.suo
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sift-1.1.1_20070330_win/imgfeatures.c
sift-1.1.1_20070330_win/imgfeatures.h
sift-1.1.1_20070330_win/kdtree.c
sift-1.1.1_20070330_win/kdtree.h
sift-1.1.1_20070330_win/LICENSE.txt
sift-1.1.1_20070330_win/LICENSE.ubc.txt
sift-1.1.1_20070330_win/match/
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sift-1.1.1_20070330_win/match/match.sln
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sift-1.1.1_20070330_win/minpq.c
sift-1.1.1_20070330_win/minpq.h
sift-1.1.1_20070330_win/README.txt
sift-1.1.1_20070330_win/sift.c
sift-1.1.1_20070330_win/sift.h
sift-1.1.1_20070330_win/siftFeat/
sift-1.1.1_20070330_win/siftfeat.c
sift-1.1.1_20070330_win/siftFeat/siftFeat.ncb
sift-1.1.1_20070330_win/siftFeat/siftFeat.sln
sift-1.1.1_20070330_win/siftFeat/siftFeat.suo
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sift-1.1.1_20070330_win/THANKS.txt
sift-1.1.1_20070330_win/Thumbs.db
sift-1.1.1_20070330_win/utils.c
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sift-1.1.1_20070330_win/xform.c
sift-1.1.1_20070330_win/xform.h

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