If you do rigging in Softimage you probably know when trying to Mirror Weights it only pays attention to the last created Symmetry Mapping Template for that model. There’s no interface to append to or join mapping templates. It gets annoying having to recreate them and verify that Soft guessed all the correct symmetrical equivalents, so…
Sometimes you need to know the length of a curve for some setups; for a while I sometimes used an addon called jsCurveLength.
However, the way it’s designed relies on the existance of the addon to evaluate. Without it, your rig is broken. I’ve made a version which is self-contained, so when you export your rig you don’t need to tell people to install any addon.