CBSviewer

In a Nutshell, CBSviewer...

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  has had 1,078 commits made by 7 contributors
  representing 26,471 lines of code
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  is mostly written in Java
  with a well-commented source code
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  has a young, but established codebase
  maintained by nobody
  with stable Y-O-Y commits
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  took an estimated 7 years of effort (COCOMO model)
  starting with its first commit in August, 2012
  ending with its most recent commit over 10 years ago