Where can I buy app development software?

I want to develop a cross platform app for iphone, ipad and android. I can see there are free packages that I can use to either develop individual apps for each platform or there are some packages that offer a cross platform development option. Could someone help me with a link to where I can look at software you can buy to do this? I need a site that provides genuine reviews of these software packages before I can choose. I'm in the UK.

Try Flex from Adobe

One Codebase-Multiple Devices

http://www.adobe.com/.../flex.html

There are many sites to build your mobile app. Here I have suggested you some sites to build your mobile app.

https://developer.apple.com/...dex.action
http://www.magmito.com/

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