Devuan packages can be "adopted": missing and claimed packages are indicated below.
A missing package is up for adoption: adopting a package means you're responsible for maintaining it up-to-date. You're also responsible for the relation with upstream.
Each package should have an issue open in its name in the devuan-maintainers issue tracker. The packages themselves belong to the packages-base group.
Note: once you have a package project in packages-base, you can update the state to maintained and link the package name to its Gitlab page.
Related issues: devuan-project#10 (closed) and devuan/devuan-project#11.