I thought I’d share some tools for DH building since it seems like so many of us seem interested.
This website is pretty much the best: http://dirtdirectory.org/
This is also an open source graphing program: http://www.gnuplot.info/
Here is project blacklight: http://projectblacklight.org/
This is Hathitrust’s algorithm generator site: https://sharc.hathitrust.org/