The base system is Debian, so apt gives you the regular Debian packages.

What apt gives you

The packages in the V\OS repository are listed on packages.v-os.dev.

The BeOS/Haiku side of things

The Vitruvian desktop itself is built from BeOS/Haiku-compatible kits; that’s the layer installed by the image. BeOS/Haiku applications, preflets, and replicants run on top of it. The relationship between the two worlds:

Both arrive through apt.

What’s still on the way

One thing worth knowing so you don’t go looking:

V\OS Docs