I have not written this plugin myself.
I found it on http://vim.wikia.com/wiki/Deleting_a_buffer_without_closing_the_window and it is to my best knowledge licensed with a CC-BY-SA license (full license text here: http://creativecommons.org/licenses/by-sa/3.0/legalcode).
It is for deleting a buffer in Vim without closing the window.
The reason for adding it here is to be able to add it to an existing Janus bundle (look at https://github.com/carlhuda/janus for instructions on how to do that).
BClose binds <Leader>bd to :Bclose unless g:bclose_no_plugin_maps or g:no_plugin_maps is set to true.
Contributions are more than welcome.
Just fork the repo and send a pull request ✌️