CG Meerkat

Origin Wrangler is a Blender add-on that expands the built-in Set Origin feature, letting you place object origins to selected geometry, along specific axes, at bounding-box points, or based on post-modifier meshes.

Cycleacoustics Reverb Generator is a Blender add-on that generates reverb impulse responses from models of reverberant environments such as rooms, caves and halls, using the Cycles render engine to trace the paths sound can take.