Hotline Successors
A company named Haxial Software (really Adam Hinkley) released a Hotline-like product named KDX.
Jörn and Mirko Hartmann released similar software deliberately kept Mac-only called Carracho in 1998 Carracho GbR - Welcome, still used today by a small, tight-knit group of users. There have also been several third party applications that implement the Hotline protocol including applications such as Pitbull Pro.
There have been several open-source versions of the Hotline Client and Server suite, which were not based on the official source code, and provide several protocol enhancements (also known as HOPE - HOtline Protocol Extension). Some versions also support an IRC bridge or KDX bridge. Most of the work on the Hotline enhancements have been done by r0r (HOPE, KDX), kang (IRC) and Devin Teske. See Darknet for details.
Hotline's largest community Mixed Blood, started by Prime Chuck and SAINT in 1998, is still active to this day on Wired. Wired is similar to Hotline and developed by Zanka software.
Read more about this topic: Hotline Communications