Dameware - remote support - send link, have own Web page - MAC

I am looking for a self-hosted option that would let our organization do the following for our remote Mac users:

1) Have a Web site hosted on our premises that we the user would log into to give us control of his MAC

2) Alternatively we send the user a link that they click on and then we can take over their MAC.

Please note that we are only talking about Mac's - not Windows PC's - and we want to host the connection ourselves - not via third-party cloud  like Logmein or Teamviewer or the Dameware cloud offering.

Thanks in advance for any feedback.