Where can I get apps for iPhone 3G besides app store?

I got an iPhone 3G as a gift yesterday and I'm having trouble getting apps that I used to have when I had an iTouch.

I tried getting Facebook, Skype and Twitter, but I can't get any of them because the iPhone 3G firmware isn't up to par with what is in in the App Store. My iPhone 3G has fw 4.2.1 and I need 4.3 for facebook and 5.0 for twitter.

Added (1). I can't get iOS 6. IOS 4.2.1 is the latest firmware for iPhone 3G.

You may need to update to IOS6 also while I could give you a list of apps it would not actually be helpful but if you go to the app store and see under the information section it will tell you if it is compatible with your phone. You won't be able to get high end games or apps but you may be surprised with what you can get.

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