I want to play PowerPoint presentations on an iPad which I create on a computer, using MS Powerpoint 2010.
I know there is an Apple app for that, but it isn't free. So, are there any other apps or methods?
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Google Docs is an option. I tested this with a .ppt from my own machine and I was surprised by how well it works. Just upload your .ppt file to your Google Docs account (which in a modern browser can be done with a simple drag-and-drop) and then allow Google to convert the document:
Once it is uploaded you can view it from your iPad by visiting Google Docs. You might want to buy a 3rd party browser like Atomic Web so you can view the presentation full-screen.