MPS, aka Meta programming System, is an open source grammar language created in 2010.
git clone https://github.com/JetBrains/MPS
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JetBrains MPS is a metaprogramming system which is being developed by JetBrains. MPS is a tool to design Domain-specific languages (DSL). It uses projectional editing which allows users to overcome the limits of language parsers, and build DSL editors, such as ones with tables and diagrams. Read more on Wikipedia...