KiCad Hybrid Footprints
This contains the footprint library hybrid-footprints.pretty
, which
contains several "hybrid" footprints. These footprints combine
footprints for several devices into one footprint, allowing flexibility
at assembly time. These are primarily designed to allow hobbyists
flexibility when sourcing components, and may have issues in automated
processes.
Installing
In either the main KiCad window or the PCB Editor, go to Preferences -> Manage Footprint Libraries. Click on the button with the folder icon below the list.

Browse to the location where the library was downloaded and click "Select Folder" to add it.
The Menagerie
HC-49 / SMD HC-49 / 3.2x2.5mm Crystal
This combines the two common "can" style footprints with a common space-saving SMD footprint. Be careful that the extra pads don't contact the can. You may need to mask them off with something like kapton tape.

DIP-8 Inductor
This is designed to work with little DIP-8 bobbins like this:

Additionally it has two pins inside with 5mm spacing that can accept standard inductors.

Multi-Pot
The Multi-Pot combines standard footprints for 9mm vertical, 17mm horizontal, and 6mm trim pots into a single footprint.

XT30 "Both Ways"
This modifies a vertical XT30 footprint to add a board-edge cutout so that it can also be soldered to the edge of the board. There are two variants with the cutout on each side.

The space between the square pads should be excluded from the board outline. An XT30 connector with its solder cup terminals turned inwards should fit in the gap.
(To be fair, I've only ever used cheap clone XT30 connectors, so this may not work with real ones...)