Luau

Luau is a dialect of Lua that is developed by Roblox as a scripting language for games on the Roblox platform. The source code of the language is available under the Expat license. Except for features that are removed from the standard library to permit execution of unprivileged code (including the  and   libraries and most of the    and   libraries), Luau aims for compatibility with Lua 5.1.

Since November 3, 2021, Luau is open source and the RFC process used to approve user-facing changes to the language and its core libraries is open to the public.