Bigsh0t 2.4 contains a Zenith Correction filter that can parse zenith correction data for Ricoh Theta SC and SC2. It also contains faster image processing code, reducing the bilinear interpolation time by 60% on SSE-supporting CPUs (which is all 64 bit processors) and by 34% on other CPUs; as well as reducing the 360 transformation time by 48%.
Download Bigsh0t 2.4 for Windows
Note: There was never a 2.3 release. It was first intended as a very small update, only adding a single flag to Stabilize360 to skip a final transform when analyzing.