Openbox
The following commands will add the main and community repositories for the version you're using to APK, as well as the edge/testing repository.
You can manually add them to the /etc/apk/repositories file if you prefer.
The command apk update should be run after updating the file in either method.
cat > /etc/apk/repositories << EOF; $(echo) http://dl-cdn.alpinelinux.org/alpine/v$(cat /etc/alpine-release | cut -d'.' -f1,2)/main http://dl-cdn.alpinelinux.org/alpine/v$(cat /etc/alpine-release | cut -d'.' -f1,2)/community http://dl-cdn.alpinelinux.org/alpine/edge/testing EOF apk update
These following commands should set up Xorg with Openbox and some necessary packages.
setup-xorg-base openbox terminator slim dbus-x11 xf86-video-intel xf86-video-ati xf86-video-amdgpu xf86-input-mouse xf86-input-keyboard setxkbmap rc-update add dbus rc-service dbus start apk add fuse gvfs gvfs-mtp gvfs-lang gvfs-archive gvfs-fuse gvfs-gphoto2 rc-update add fuse apk add faenza-icon-theme
This will install lot of packages as gtk, cairo, python, perl, and some xorg modules for device user interaction.
setup-xorg-base xf86-video-intel xf86-video-ati xf86-video-amdgpu xf86-video-modesetting-0.9.0-r6 xf86-video-intel-2.99.917_git20170325-r0 xf86-video-amdgpu-doc-1.3.0-r0 xf86-video-sunleo-doc-1.2.2-r0 xf86-video-nouveau-doc-1.0.15-r0 xf86-video-vmware-doc-13.2.1-r0 xf86-video-dummy-0.3.8-r0 xf86-video-vesa-doc-2.3.4-r2 xf86-video-nv-doc-2.1.21-r0 xf86-video-nouveau-1.0.15-r0 xf86-video-siliconmotion-doc-1.7.9-r0 xf86-video-i740-1.3.6-r0 xf86-video-apm-doc-1.2.5-r8 xf86-video-savage-doc-2.3.9-r0 xf86-video-amdgpu-1.3.0-r0 xf86-video-s3virge-1.10.7-r1 xf86-video-openchrome-doc-0.6.0-r1 xf86-video-s3-doc-0.6.5-r8 xf86-video-ast-1.1.5-r1 xf86-video-apm-1.2.5-r8 xf86-video-s3-0.6.5-r8 xf86-video-fbdev-doc-0.4.4-r5 xf86-video-siliconmotion-1.7.9-r0 xf86-video-vmware-13.2.1-r0 xf86-video-r128-doc-6.10.2-r0 xf86-video-ati-doc-7.9.0-r0 xf86-video-sunleo-1.2.2-r0 xf86-video-fbdev-0.4.4-r5 xf86-video-dummy-doc-0.3.8-r0 xf86-video-rendition-doc-4.2.6-r1 xf86-video-ati-7.9.0-r0 xf86-video-rendition-4.2.6-r1 xf86-video-i128-1.3.6-r8 xf86-video-tdfx-doc-1.4.7-r0 xf86-video-glint-doc-1.2.9-r0 xf86-video-i740-doc-1.3.6-r0 xf86-video-tdfx-1.4.7-r0 xf86-video-chips-1.2.7-r0 xf86-video-chips-doc-1.2.7-r0 xf86-video-sis-0.10.9-r0 xf86-video-qxl-0.1.5-r0 xf86-video-intel-doc-2.99.917_git20170325-r0 xf86-video-vesa-2.3.4-r2 xf86-video-xgixp-1.8.1-r8 xf86-video-glint-1.2.9-r0 xf86-video-ast-doc-1.1.5-r1 xf86-video-ark-doc-0.7.5-r7 xf86-video-r128-6.10.2-r0 xf86-video-xgixp-doc-1.8.1-r8 xf86-video-sis-doc-0.10.9-r0 xf86-video-nv-2.1.21-r0 xf86-video-s3virge-doc-1.10.7-r1 xf86-video-openchrome-0.6.0-r1 xf86-video-ark-0.7.5-r7 xf86-video-savage-2.3.9-r0 xf86-video-i128-doc-1.3.6-r8 apk add xf86-input-mouse xf86-input-keyboard