You've probably used Android Beam™ before, the AOSP Gallery, Contacts, Browser etc all use it.
However, I haven't seen any file managers that implement sending files using Android Beam™, so I made this app.
To use it, tap the share button on any file in any file manager, then tap two devices together.
The API to send files using Android Beam™ was added in 4.1, so the application won't work on anything before that (both devices need 4.1, but only the sender needs the app)
This application is ad-supported, there's a donate button in the app, but please note, it does NOT disable ads, this isn't a con scheme or anything, but this is my first Android app, and until I figure out how to track donations using an API or otherwise, that's how it's going to be (patch welcome though!)
The application is also open source, licensed under GPLv3, with the source available on Github: https://github.com/MohammadAG/android-file-beam
About the ™, Android docs have it on all mentions of Android Beam™, and I'm not sure about legalities and stuff, so I did the same.