BluetoothEnable is a project mainly written in ..., it's free.
bluetooth enabler for IOS using undocumented APIs. Cannot be used for App Store
This software is free to use as you wish, as long as attribution is provided.
This program cannot be used to submit to the App Store, as it uses private APIs and will not pass curation.
It is not fancy, and was written in less than an hour, but I find it useful myself.