This collection of sample binaries were used for the testing described in the Binary Ninja blog.
Note that the original GNU coreutils that were compiled in the byteweight set are released under the GPLv3 or later. They are distribuetd here in the same form that they are available in the Byteweight VM available here with the addition of some new compiled binaries from Dennis Andriesse.
The CGC corpus binaries are derived from the cb-multios repository from Trail of Bits and are licensed under the MIT license.
Busybox was compiled from BusyBox version 1.24.1 which is released under the GPLv2.