Cosmo is an open-source, statically-typed, interpreted programming language. It's in its very early stages of development, and there is still much to fix and improve. Since it's an open-source project, you can contribute or suggest any changes to Cosmo yourself!
The Wizard101 Wiki API is an API wrapper around the official Wizard101 Wiki. This Wiki API allows you to very easily access any data about Wizard101. Not all Wiki endpoints are currently supported (namely housing items and castles), but you can contribute them yourself if you'd like.
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Luay is an extended version of the Lua programming language. It is not a superset, as no grammar has been changed. It does however include "batteries included", providing lots of utility out of the box. This utility includes overloaded string operators, libraries (like Java'sStringBuilderor Node'sEventEmitter), a main function, OOP helpers, lambda expressions, and more.
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Roblox Crystal (roblox-cr) is a Crystal to Luau source-to-source compiler. It converts code from the Crystal programming language to Roblox's Luau language. It also comes with a Crystal type generator, which accesses the Roblox API documentation and automatically generates Crystal type definitions for each object.