GitHub has said it'll be sunsetting the Atom text editor on December 15, 2022, and will archive al projects under the organization.

We recognize that Atom is still used by the community and want to acknowledge that migrating to an alternative solution takes time and energy. We are committed to helping users and contributors plan for their migration.

Today, we’re announcing the sunset date six months out.
Over the next six months, we’ll continue to inform Atom users of the sunset in the product and on atom.io.
On December 15, 2022, we will archive the atom/atom repository and all other repositories remaining in the Atom organization.

[github.blog...]