Speaking of pedals, they certainly account for the biggest share of power supplies and accessories in this section. They range from compact wall plugs and cables like the Visual Sound 1 Spot system to bigger units such as the Voodoo Lab Pedal Power Mondo. Those larger models tend to be much more feature-packed, too. For example, check out the MXR M238 ISO-Brick Power Supply Unit: its outlets can handle all kinds of different voltage and current requirements, and it even offers variable outputs that can replicate the effects of voltage sag from drained batteries.
For your other gear, the type of power supply you need will naturally depend on what that gear is. There's the Yamaha Survival Kit D2 and B2 for instance, which includes power supplies among other hardware and accessories for your keyboard. If you're an audio specialist using high-end microphones that require phantom power, you'll find models like the Nady SMPS-1X Phantom Power Supply ready to deliver it. And these are only the tip of the iceberg!
There are about as many power supplies out there as there are components that need them... which probably makes a lot of sense. There are also lots of different reasons why you might be looking for one. Pre-connect your pedalboard to a shared power supply to make setup and teardown easier; replace a worn-out wall adapter for your digital piano; provide much-needed juice to a studio microphone; and more! It starts with identifying your power needs, and from there, finding the best power supplies to meet them is a piece of cake.