Each mode's symmetry is denoted as ^{d}I, it has a degeneracy d, and transforms as an irrep I of the Skyrmion's symmetry group. We use the notation of Cotton. Character tables may be found here.
The zero modes are translations, rotations and isorotations. These decompose as ^{1}A_{2u} + ^{2}E_{u}, ^{1}A_{2g} + ^{2}E_{g} and ^{1}A_{1u} + ^{1}B_{2u} + ^{1}B_{2g} respectively.
There are several ways to describe the B=8 which are useful here. One is to view it as two B=4 cubes; another is as four B=2 tori. One can also identify it as central cube surrounded by two tori.
Freq.  Symmetry  Description/Notes  Visualization 

0.18  ^{1}A_{1u}  The cubes rotate
around their common C_{4} symmetry axis, out of phase. 

0.19  ^{1}A_{2g}  The cubes isorotate around the red isoaxis, out of phase. 

0.22  ^{2}E_{u}  The cubes rotate towards each other forming a bentarm. 

0.25  ^{1}A_{1g}  The cubes move away from each other. 

0.33  ^{1}B_{1g}  The cubes isorotate around the white/black isoaxis, out of phase. 

0.35  ^{1}B_{1u}  Each cube vibrates like the B=4, 0.48 mode out of phase. 

0.38  ^{2}E_{g}  Similar to the 0.22 mode, but the rotation is in phase yielding a shear mode of the two cubes. 

0.43  ^{1}A_{2u}  The cubes each vibrate like the B=4, 0.46 mode out of phase. The outgoing tori lie in the plane perpendicular to the common C_{4} symmetry axis. 

0.44  ^{1}A_{1g}  The central cube vibrates like the B=4, 0.46 mode. 

0.44  ^{2}E_{u}  Each cube vibrates like the B=4, 0.48 mode out of phase. 

0.45  ^{1}B_{2u}  Each cube vibrates like the B=4, 0.46 mode out of phase. 

0.46  ^{1}B_{1g}  Each cube vibrates like the B=4, 0.46 mode in phase. 

0.47  ^{1}B_{2g}  The outer tori vibrate like the B=2, 0.37 mode in phase. 

0.48  ^{1}B_{2g}  The central cube vibrates like the B=4, 0.48 mode. 

0.48  ^{2}E_{g}  Each cube vibrates like the B=4, 0.48 mode, in phase. 

0.52  ^{1}B_{1u}  Each cube vibrates like the B=4, 0.52 mode, in phase. 

0.59  ^{2}E_{g}  Each cube vibrates like the B=4, 0.62 mode out of phase realized in such a way that the central cube's deformation is small. 

0.62  ^{1}B_{2u}  Each cube vibrates like the B=4, 0.62 mode in phase realized in such a way that the central cube significantly deforms. 

0.72  ^{1}A_{1g}  The center cube breathes. 

0.72  ^{2}E_{u}  Each cube vibrates like the B=4, 0.94 mode, realized such that two edges of the central cube pull away from each other. 

0.81  ^{1}B_{1g}  The central cube vibrates like the B=4, 0.87 mode while the top and bottom tori vibrate like the B=2, 0.37 mode. All motion is due to breathing. 

0.83  ^{1}B_{2g}  Each cube vibrates like the B=4, 0.94 mode in phase. 

0.84  ^{1}B_{1u}  The central cube vibrates like the B=4, 0.87 mode. 

0.85  ^{1}A_{2u}  One cube inflates while the other deflates. The central cube moves back and forth between the two tori. 

0.86  ^{2}E_{u}  Two neighboring faces inflate while the opposite faces deflate. The faces in between move their positions to compensate. 

0.88  ^{2}E_{g}  Each cube vibrates like the B=4, 0.87 mode out of phase. 

0.91  ^{1}A_{1g}  Both cubes breathe in phase. 

0.94  ^{2}E_{u}  Similar to the 0.22 mode but physically due to isorotation. 

0.98  ^{1}A_{2u}  The top and bottom tori inflate and deflate out of phase. 

1.03  ^{2}E_{g}  Each cube vibrates like the B=4, 0.94 mode out of phase. 

1.05  ^{1}B_{1g}  Similar to the 0.46 mode but physically due to a breathing motion. 

1.06  ^{1}B_{1u}  Similar to the 0.35 mode but physically due to a breathing motion. 

1.08  ^{1}B_{2u}  Similar to the 0.45 mode but physically due to a breathing motion. 

1.10  ^{2}E_{u}  The two cubes vibrate like the B=4, 1.14 mode in phase. 
Notes
Hover over an image (or if you're on a tablet/phone: tap on an image) to make it come to life. The hoverover text tells you the Cartesian realization of the element of the irrep you are looking at.