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Most of these are international and open to everyone, but check the details for any restrictions.
Some of the contests are free and online. You don't have to spend a penny (or cent) to enter these and you might just win £1,000s or $1000s simply by entering. What have you to lose?
And if you run a contest yourself and it isn't included, please use the 'Contact Me' link in the Welcome to let me know and I'll include it.