If you consider all the versions of Mac OS to be a "line", then the latest series, Mac OS X, would generally fit your description. However, it'd be stretching it a bit to call it "recent"; The first version of Mac OS X was released in 1999.
Linux
for windows its vista
Yes it is an Operating System similar to Windows but it is a multi user
Symbian
Linux, and the BSD-derived versions (FreeBsd, PCBsd, etc.)
Linux is a computer operating system which has recently become more more popular. One can download various Linux distributions directly from their website.
Android is a mobile operating system designed to be run on cellular devices, and more recently tablet computers and television sets.
GNU/Linux is a 'Unix-like' operating system because it was based on Unix, and is similar in many ways.
iOS is the iPhone's operating system that is used by Apple. It is similar to the Mac OS, and is theoretically more stable than Windows OS.
A Guest operating system is one that runs on top of another, similar to a program. Guest operating systems are usually run in a "virtual machine", which does not interact directly with the real hardware of the computer.
Operating systems have become more user-friendly and faster over the years. This helps users become more productivity when they are working.
Some Operating Systems periodically look for pages that have not been recently referenced and add them to the Free page queue, after paging them out if they have been modified.
Windows 7 is similar to any other Windows operating system. There are some upgrades to make the programs more streamlined, but it works essentially the same way as XP did.