gui-apps/wayter: a graphical greeter client for greetd. Greetd and the host's PAM setup handle authentication; the overlay does not configure a login service or compositor.
gui-apps/wayfinder: a GTK 4 file manager with a places sidebar and previews for supported text files and images. It installs a desktop menu entry.

Enable the overlay

Create /etc/portage/repos.conf/wfalkowski-overlay.conf:

[wfalkowski-overlay]
location = /var/db/repos/wfalkowski-overlay
sync-type = git
sync-uri = https://git.anchorhost.eu/wfalkowski/wfalkowski-overlay/
masters = gentoo
priority = 50

Portage will clone the overlay from the hosted Git repository into /var/db/repos/wfalkowski-overlay and keep it updated when you sync repositories.

Both packages are keyworded ~amd64. Add them to /etc/portage/package.accept_keywords/wfalkowski-overlay if you want to install either package:

gui-apps/wayter ~amd64
gui-apps/wayfinder ~amd64

Review the proposed build, then install the package you want:

emerge -pv gui-apps/wayfinder
emerge -av gui-apps/wayfinder

Replace gui-apps/wayfinder with gui-apps/wayter to install Wayter. Wayter needs a working greetd, PAM, and compositor configuration on the host.