Yes, if you have the software and knowledge to make it all you would need to pay is the $25 fee to register as a Google Play Developer and you can upload it to the Play Store.
If you are not proficient in coding, there are still some free options with pre-written templates. However, they offer limited customization options.
There are both free and paid apps available for android phones.
You can find them on the android market under the free section. This will allow you to find the top free apps for your latest android phone. This is how I find the best android apps.
Some of them are, but not all of them.
Android jailbreak
RedTube
it say free figure it out dummy
Apps from WeeWorld, Inc. are Android free apps that allow you to play online as well.
I found these free killer android apps they got some great stuff in mobile gaming check it out in the related links " FREE MOBILE APPS"
market app.
Some of the apps are paid for, others are free. Plenty of the free ones are excellent. Watch out for 'free' apps that want to charge you for extras once you are using them.
Yes and free too as most apps are for android, also gps navigation
as of this moment, the number of android apps is always expanding. considering that people can now make their own apps, it could be a while until the apps stop flowing in