BWO Seattle Working Group page 
Our working group's goal is to learn to design and code smart contracts, with an emphasis on language exploration and understanding. Initially, we plan to focus on the following 2 languages and platforms (but we would welcome any others):
1 - Ethereum/Solidity page
Solidity is a contract-oriented, high-level language for implementing smart contracts. The syntax is similar to that of JavaScript and it is designed to target the Ethereum Virtual Machine (EVM).
2 - RChain/Rholang page
Rholang is the Turing complete language based on Greg Meredith's Reflexive Higher Order Calculus (the RHO Calculus); a new mobile process calculus that Greg conceived of for building scalable blockchains.
RChain is a Seattle Area blockchain startup that has its sights set on building a scalable blockchain. page
3 - Todo add Hyperledger and Gravity...