This is a simple to use, free histogram analysis tool. Using Excel or Libre Office (Calc) it is possible to create historgrams in a semi-automated fashion. However, loading large data files (more than 1 milion rows) seems to be relatively slow considering the data analysis is streight forward and not computing intensive.
This tool automatically reads a text file (data presented in rows) of an arbitrary length, performs basic statistical analysis, and draws a histogram automatically selecting optimal number of bins.
Latest version (64 bit only):