Boxcryptor Classic is commercial software

However, there is a limited-use free license.
See the homepage for more info: https://www.boxcryptor.com/en/classic
Boxer is under GNU GPL

All (or most of) Boxer source files have a top comment that states that
the file is under GNU GPL terms. For example, see:

https://github.com/alunbestor/Boxer/blob/066c424f02f7d061e618494796bad8d61865eb5e/Boxer/BX2ButtonJoystickLayout.h
https://github.com/alunbestor/Boxer/blob/066c424f02f7d061e618494796bad8d61865eb5e/Boxer/Application%20Delegate/BXApplication.h
https://github.com/alunbestor/Boxer/blob/066c424f02f7d061e618494796bad8d61865eb5e/Boxer/BX2ButtonJoystickLayout.m
Breach is under MIT license

https://github.com/breach/breach_core/blob/master/LICENSE
Breakaway is under GNU GPL

http://sourceforge.net/p/breakaway/code/ci/master/tree/COPYING
Brightness is gratis
Brogue is under GNU AGPL

Sources are distributed in the same archive with the binary. It contains
a license-agpl.txt file.
Brow is gratis
Browserstack is commercial software