Download of DoorStop X Firewall 2.4 for Mac was on the developer's website when we last checked. We cannot confirm if there is a free download of this app available. The bundle identifier for this application is com.opendoor.doorstopx.
The following versions: 2.4 and 2.3 are the most frequently downloaded ones by the program users. Please check the Mac app with an antivirus before launch as it is downloaded from the developer's website, and we cannot ensure that it is safe. The common filename for the program's installer is DoorStopX2.3.dmg. The application lies within Security Tools, more precisely Mac protection. This Mac app is a product of Open Door Networks, Inc.
From the developer:
All TCP services protected by default.
Ability to tune protection on a service-by-service and address-by-address basis.
Protect services by name or port number(s).
Default protection setting which applies to all unspecified services.
Four protection modes: deny all, allow all, allow by address, deny by address.
Setup assistant to help you best secure your Mac's services.
You may want to check out more software for Mac, such as DNS Firewall, Scudo or Proxifier, which might be related to DoorStop X Firewall.
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