The old Kingston(?) ADB trackballs for the Mac

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Kensington. I have two. They rock.
Also snap on the following:

Gravis Mac Gamepad.Apple remotes for TV/video cards

ALPS Glidepoint ADB trackpad {x2}

numeric ADB keypad {x2, one with an integrated trackball}

50 pin SCSI DVD drives {x7 in a storage tower}

Radius Rocket 68040/33MHz card

Through The Looking Glass original disk

Daystar adapter to put PowerCache or Turbo040 in a Mac IIcx.

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Some of the above thanks to members here!

Others that come to mind:

Digidesign Nubus Audiomedia II and Samplecell II cards

PCI Samplecell II

Supermac Video Spigot capture card for the IIsi PDS }

Dual IIsi/SE/30 PDS adapter for above

Radius Pivot video card for IIsi/SE/30

A /edit/ Grand Vimage LC PDS video card - I couldn't find drivers for this anywhere.

PowerComputing ADB keyboard and mouse

Black ADB Apple Extended Keyboard II