Most of our plugins (non-ad ones) are also open sourced on our github account:
Thanks guys!
I can build plugins with Corona Enterprise (Small 79$)?
I do not need Unlimited?
Ivan
You can build plugins with a Corona Enterprise Indie license for your personal use in Corona Enterprise projects or for sharing with the community on the Corona plugin store. You can build plugins for other people to use in their Corona Enterprise projects.
If you want to use the Corona SDK Simulator to build projects and not build with Enterprise, you will need Unlimited so you can self-host your plugins.
Rob
Ok, if I got you well: Unlimited can build projects with my plugins from Corona Simulator and Pro/Small can build projects with my plugins from xCode (not from Simulator).
Thanks.
Ivan
You could build projects from the simulator using your plugins. For other people to use plugins you make, they would have to:
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Get it from store.coronalabs.com
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Get the plugin files from you and build with Corona Enterprise but not the simulator
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Have their own Enterprise Unlimited so they could self-host their own plugins.
Rob
To add-on to what Rob said, with Corona Enterprise Unlimited you can host plugins for your otwn development like so:
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Upload the *.tgz file to either a public dropbox folder or your server. More info here: https://docs.coronalabs.com/daily/native/hostedPlugin.html
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Add the url to the plugin in your supported platforms table in build.settings (more info in the above link)
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Write a plugin stub for mac/win simulators. More info on that here: https://docs.coronalabs.com/native/plugin/submission.html
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Build using the corona simulator
Got you! 
Thanks.
I have one last begginer question:
Is generally enough to find some useful code on stack owerflow (Objective C code for iOs platform), and paste it in my plugin with minor modifications to it?
I am talking about simple functions.
Many thanks.
Ivan