What are 3 operating systems for personal computers?

I need to write a brief report on three different personal computer operating systems. Since this is for Windows XP class, I think Windows should not be included. Anyone who answers (with a genuine answer) will recieve a thumbs up for their trouble.
Thanks

Linx
Unix
Mac OS X
BSD
IBM OS/2
Windows

The History of the Personal Computer

…

…

…

Samsung Chromebook (Wi-Fi, 11.6-Inch) $202.31 The New Samsung Chromebook For Everyone. The Samsung Chromebook is a new computer that helps you get everyday things done faster and easier. It starts in seconds, has virus protection built-in, and runs your favorite Google apps plus thousands more. The Chromebook comes with leading Google products, like Search, Gmail, YouTube and Hangouts, so you can work, play, and do whatever you …

Transcend 32 GB Class 10 SDHC Flash Memory Card (TS32GSDHC10E) $24.10 This Transcend 32GB Class 10 SDHC Memory Card is for you to expand the memory capacity for your compatible device like digital camera, camcorders, music players, and more cool device that is with a SD card slot available.It is ideal for storing media-rich files such as music, videos, and photographs. FEATURES: Fully compatible with SD 2.0 Standards Class 10 compliant Easy to use, plug and play …

WD My Passport 1TB Portable External Hard Drive Storage USB 3.0 Black $159.99 My Passport offers up to 1 TB capacity in an amazingly small enclosure. It features ultra-fast USB 3.0 connectivity; compatibility with USB 2.0; automatic, backup software; and password protection and hardware encryption to help protect your files from unauthorized use….

The Personal Internet Address & Password Log Book $3.91 Are you tired of losing track of those login/usernames and passwords you create every time you visit a new Web site? Do you have sticky notes and scraps of paper scattered about your office and home computer space covered with these vital pieces of information, but never seem to be able to put your hands on them when you need them? Now you can keep important Web site addresses, usernames, and pass…

Steve Jobs, Steve Wozniak, and the Personal Computer (Graphic Library: Inventions and Discovery series) $3.16 In graphic novel format, tells the story of how Steve Jobs and Steve Wozniak developed the personal computer….