westmalle

In a Nutshell, westmalle...

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  has had 1,521 commits made by 2 contributors
  representing 18,986 lines of code
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  is mostly written in Kotlin
  with a very 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 5 years of effort (COCOMO model)
  starting with its first commit in January, 2015
  ending with its most recent commit almost 7 years ago