Open source GNU/Linux client that supports most of the latest Hotline features.

Client/server suite for Linux/Unix operating systems. Includes shxd, a popular Hotline daemon that is integrated into the mhxd application suite.

Project of Hotsprings, Inc. that releases the source code to Hotsprings' projects under the GNU Public License. The Hotline Connect server source is available under the branch, "OpenLine".

A Hotline server for Unix-like operating systems that was abandoned by its creator, currently pending further development.

A Blue Wave, QWK, OMEN and SOUP offline packet reader for Unix, DOS, OS/2 and Win32 BBS Packages. Open source software.

A free software module that makes it possible to extend AutoCAD with the Python programming language, in a similar way as with AutoLISP.

Free command line RF/microwave harmonic balance circuit simulator, for analog nonlinear circuits simulation with diode and MESFET nonlinear elements.

An Open Source interactive simulator frontend for Verilog and VHDL circuit simulation.

Platform independent program for converting bitmap to vector graphics distributed under GPL.

An Open Source program that allows to open, view, print and convert DWG or DXF files up to version 2002 on the Linux platform.