gomdb

In a Nutshell, gomdb...

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  has had 78 commits made by 17 contributors
  representing 8,564 lines of code
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  is mostly written in C
  with a well-commented source code
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  has a codebase with a long source history
  maintained by nobody
  with stable Y-O-Y commits
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  took an estimated 2 years of effort (COCOMO model)
  starting with its first commit in March, 2013
  ending with its most recent commit over 7 years ago