Wren

Wren is a programming language created in 2013 by Bob Nystrom.

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Wren is a small, fast, class-based concurrent scripting language.

Wren website
Wren is developed on GitHub and has 5,694 stars
There are at least 8 Wren repos on GitHub
file extensions for Wren include wren
Wren is written in C
The Google BigQuery Public Dataset GitHub snapshot shows 3 users using Wren in 3 repos on GitHub
Explore Wren snippets on Rosetta Code
Read more about Wren on the web: 1.
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Example from the web:

System.print("Hello, world!")

class Wren {
  flyTo(city) {
    System.print("Flying to %(city)")
  }
}

var adjectives = Fiber.new {
  ["small", "clean", "fast"].each {|word| Fiber.yield(word) }
}

while (!adjectives.isDone) System.print(adjectives.call())

Example from hello-world:

IO.print("Hello World")

Feature	Supported	Token	Example
Strings	✓	"	"Hello world"
Print() Debugging	✓	IO.print
Comments	✓		// A comment
Line Comments	✓	//	// A comment
Semantic Indentation	X

Wren - Programming language

Language features