There are 2 repositories under atom-grammar topic.
Gentoo Linux development support in Atom
⚛️ Atom syntax highlighting for Svelte ⚛️ | Moved to https://tcrowe.commons.host/contact
📦 Atom language package for ⚜ Europa Universalis IV ⚜
Atom editor package: Set grammar for file by adding mode comment, like EMACS
Stone package for Atom
Atom language support for nsL Assembler, including grammar, snippets and build system
Syntax highlighting for SFV files