DonorLogin Which is also considered as a reserved slot plugin is to make sure admins or who ever has the permission can log in even if the server is full. It is made by xXMaTTHDXx who is trying to help server owners promote there server with original plugins! DonorLogin does not have commands its easy as that just a simple permission node and a config.
DonorLogin Is so far the first of its kinda of what I have seen, It encourages players to be able to always count to get on the server no matter if its full or not.
The only permission node for this project is donor.login