Download of DesktopServer 3.8.3 for Mac was available from the developer's website when we last checked. We cannot confirm if there is a free download of this app available. We recommend checking the downloaded files with any free antivirus. This free Mac application was originally developed by Virtuosoft. The application lies within Internet & Network Tools, more precisely Network tools.
From the developer:
With this program, you can choose fictional domain names to personalize each of your projects and create dozens of virtual servers in seconds. Using domain names you choose allows DesktopServer to support friendly permalinks and you can develop complete solutions that support sub-domain and domain mapping.
You may want to check out more Mac applications, such as Lighthouse, Throttled Pro or HippoVNC, which might be related to DesktopServer.