Rholang - Contract language

Rholang is an open source contract language created in 2016.

Source code:

git clone https://github.com/rchain/rchain

#589on PLDB

8Years Old

Rholang is an open and scalable blockchain language designed for speed, reliability and formal process orchestration build on latest research in the reflective high order process calculus.

Rholang website
Rholang is developed on GitHub and has 678 stars
Rholang docs
Rholang first developed in https://rchain-community.github.io/
PLDB estimates there are currently 13 job openings for Rholang programmers.
Rholang is written in Scala & C & C++ & Python
Rholang on Twitter
There are 1,000 members in the Rholang subreddit
Indeed.com has 13 matches for "couchdb developer".

Example from the web:

new helloworld, stdout(`rho:io:stdout`) in { 
   contract helloworld( world ) = { 
       for( @msg <- world ) { 
           stdout!(msg) 
       }
   } | 
   new world, world2 in {
        helloworld!(*world) | 
        world!("Hello World") |
         helloworld!(*world2) | 
         world2!("Hello World again")
   }
}