Free of charge ... NO. Snow Leopard is a paid upgrade.
Before buying anything you should first make sure your machine will accept the upgrade you have in mind.
Minimum specs for Snow Leopard. Mac OS X v10.6 Snow Leopard -Read the Technical Specifications
Note. You can now buy Snow Leopard from the Apple store on line again.
In the USA. Go to Mac OS X 10.6 Snow Leopard - Apple Store (U.S.)
In Europe or otherwise … call your National Apple Helpline. Find it at … http://support.apple.com/kb/HE57
In the UK … Mac OS X 10.6 Snow Leopard - Apple Store (UK) Where the last known price was £14.
Once you have upgraded to Snow Leopard you will need to apply the Combo updater. Mac OS X 10.6.8 Update Combo v1.1 and follow with a software update to pick up any later improvements.
For 71, and anyone else answering this kind of question;
The URL for the SL update is identical for all countries, except for the country code just after apple.com;
Substitute that with /uk/, /de/, /fr/ and so on for other countries.
Now I'm really confused. By accident I clicked on your profile and a message came up. To learn more about noondaywitch ... sign in or register.
I did neither at first but some while after I'd responded to your post I tried to register but the message had changed to an Apple style message promising to 'be back shortly'. Since then the option has gone.