Seems you are looking for a package present in the Debian repositories but not in the Devuan repositories.
ie: [snapd] and not [snap]. <-  the DNA sequence with hidden markov mode application.

All official Devuan packages are sourced from the Debian repositories as long as they can be used directly and without intervention from the Devuan devs.

Otherwise, they are sanitised of their reliance on [systemd] and only then made available for installation.
If that is not possible, they are banned from the Devuan repositories.

See the list here.
You will find [snapd] there as it depends on [systemd].

That said, if a specific package is not in the Debian repositories, you will not find it in the Devuan repositories.

Best,

A.

Do to the fact, that very promiment (and good) packages are not in the repositories, I tried to install
'snap(d)', where "everyone" told, it is in debian(11/12/13). I cannot find it for daedalus.
I have this repos:
- main
- updates
- proposed-updates
- backports,
all for daedalus!

But i see: "snap - location of genes from DNA sequence with hidden markov model", uupps!

Update, my sources.list is this:

deb http://deb.devuan.org/merged daedalus main non-free-firmware non-free contrib
deb http://deb.devuan.org/merged daedalus-updates main non-free-firmware non-free contrib
deb http://deb.devuan.org/merged daedalus-security main non-free-firmware non-free contrib
deb http://deb.devuan.org/devuan daedalus-proposed-updates main
deb http://deb.devuan.org/merged daedalus-backports main non-free-firmware non-free contrib

The error, I am getting is the following, with a suspect message:

$ apt install snapd
Reading package lists... Done
Building dependency tree... Done
Reading state information... Done
Package snapd is not available, but is referred to by another package.
This may mean that the package is missing, has been obsoleted, or
is only available from another source

E: Package 'snapd' has no installation candidate

Any help is welcome!

Thanks,
Manfred