Apple

Apple is an American multinational corporation.

History
When the Springfield Nuclear Power Plant was on the verge of a meltdown, an employee is stealing a Mac SE from Apple with a dual floppy drive.

When Waylon Smithers was using a computer when he searched after a temporary replacement he used a computer from Apple.

Homer told a guy at the record store that the "US Festival" was sponsored by the guy from Apple Computers.

A look at Homer's brain it's showed at is designed as the old version of Mac OS from Apple.

Under a town meeting was a Mac from Apple stolen.

When Lisa researching what Springfield will look like in 50 years she use an iMac from Apple.

The computers on the Java Server is iMacs G3s from Apple.

Moe was written on an iMac from Apple.

Non-canon
A couch gag features the Simpsons family being dragged to the couch on an Apple screen.

The America Onlink was used on an Apple computer.