Take this with a grain of salt based on where I'm from, but the WCP 32DP gears have to be some of my favorite products so far. They make getting a large reduction in a lightweight and compact packaging simpler and more effective than planetary gearboxes (and in my experiences, more reliable). The seamless integration with pinions for the BAG motor, RS775, and RS550 alongside their perfectly chosen gear sizes (in 20, 40, 60, and 80 teeth) make it so that most any mechanism (especially intakes) can be powered off of one or two stages to get the perfect reduction.

These are a product I haven't seen widely used or known about that I feel would greatly help teams accomplish some of their more complex or weight-dependent design goals.