Apple now offers a formerly paid product for free. It has been out of fashion for a few years, but it brings something to one or the other: a 10.7 and 10.8 version of Mac OS X.
The versions known as Mac OS X Lion and Mac OS X Mountain Lion can still be purchased for just under 20 euros in the App Store. However, this is no longer necessary as of now. Who follows these download links
Can now download the old operating systems for free. So Apple shows at least some heart for older Macs and you can update to a version that is not quite so old. When using the Internet, of course, should still use a current browser and no longer Safari.
Positive affected Macs are from the years 2007 and 2008, so if you still have a sweetie lying around, you can now at least get Mac OS X Mountain Lion for free.