Here are some surveys and comparisons of many projects. In particular, we want to learn from their design choices !

• Alternative Shells
  • Internal DSLs for Shell
• The Biggest Shell Programs in the World
• External Resources|ExternalResources -- More Shell Resources

More:

• Alternative Regex Syntax
• Survey of Config Languages
• Polyglot Language Understanding
• Process Tracing Projects

OS

• Survey of Hosting Platforms aka Distributed OS
• Survey of Integrated Language and OS Projects

History

• Survey of FOSS Project Origins