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 two ways to describe the B=8 which are useful here. One is to view it as two B=4 cubes; the other is as four B=2 tori.
Freq.  Symmetry  Description/Notes  Visualization 

0.12i  ^{1}A_{2g}  Each cube isorotates around the red isospin axis, in opposite directions. This mode connects the B=8u Skyrmion to the lower energy B=8t Skyrmion, hence its imaginary frequency. 

0.01  ^{1}A_{1u}  The cubes rotate around their common C_{4} symmetry axis, out of phase. 

0.21  ^{2}E_{u}  The cubes rotate towards each other, making a bentarm shape. 

0.22  ^{2}E_{g}  The cubes rotate away from each other, yielding a shear mode. 

0.29  ^{1}B_{2u}  The cubes isorotate about the white/black axis out of phase. 

0.30  ^{1}A_{1g}  The cubes move away from each other. 

0.34  ^{1}B_{2g}  The outer tori vibrate like the B=2, 0.37 mode in phase. 

0.40  ^{1}A_{1g}  Each cube vibrates like the B=4, 0.46 mode. The individual tori come out along the C_{4} symmetry axis. 

0.45  ^{1}B_{1g}  Each cube vibrates like the B=4, 0.46 mode in phase. The tori come out along the axes perpendicular to the C_{4} symmetry axis. 

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

0.47  ^{2}E_{g}  Each cube vibrates like the B=4, 0.48 mode in phase. 

0.48  ^{1}A_{2u}  The two cubes vibrate like the B=4, 0.46 mode out of phase. 

0.49  ^{2}E_{u}  Each cube vibrates like the B=4, 0.48 mode out of phase. 

0.51  ^{1}B_{1u}  The central cube vibrates like the B=4, 0.52 mode. 

0.52  ^{1}B_{2u}  Each cube vibrates like the B=4, 0.46 mode out of phase. 

0.53  ^{1}B_{2g}  Each cube vibrates like the B=4, 0.52 mode out of phase. 

0.57  ^{1}B_{1g}  Each cube vibrates like the B=4, 0.62 mode such that one cube is a mirror image of the other. 

0.57  ^{1}B_{2g}  Each cube vibrates like the B=4, 0.48 mode in phase. 

0.68  ^{2}E_{u}  Each cube vibrates like the B=4, 0.62 mode such that one cube is a mirror image of the other. 

0.70  ^{2}E_{g}  Each cube vibrates like the B=4, 0.62 mode out of phase. 

0.78  ^{1}A_{1g}  The central cube breathes. 

0.85  ^{1}A_{2u}  Similar to the 0.40 mode but physically due to a breathing motion. 

0.86  ^{2}E_{g}  Each cube vibrates like the B=4, 0.87 ^{3}T_{1u} mode out of phase. 

0.86  ^{2}E_{u}  The central cube vibrates like the B=4, 0.87 ^{3}T_{1u} mode. 

0.88  ^{1}B_{1u}  Each cube vibrates like the B=4, 0.94 mode out of phase. 

0.91  ^{1}A_{1g}  Each cube breathes, in phase. 

0.92  ^{2}E_{u}  Similar to the 0.68 mode but physically due to an isorotation. 

0.93  ^{1}B_{2u}  The cubes vibrate like the B=4, 0.94 mode in phase. 

0.96  ^{1}B_{1g}  Similar to the 0.45 mode but physically due to a breathing motion. 

0.96  ^{1}A_{2u}  Similar to the 0.48 mode but physically due to a breathing motion. 

0.97  ^{2}E_{g}  Each cube vibrates like the B=4, 0.94 mode in phase. 

1.04  ^{1}B_{2g}  Similar to the 0.53 mode but physically due to a breathing motion. 

1.09  ^{1}B_{2u}  The central cube vibrates like the B=4, 0.94 mode. 

1.13  ^{2}E_{u}  Each cube vibrates 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.