BitchX is a free IRC client. The initial implementation, written by "Trench" and "HappyCrappy", was a script for the IrcII chat client. It was converted to a program on its own right by panasync (Colten Edwards). BitchX 1.1 final was released in 2004. It is written in C, and is a console application. A graphical interface is also available, which uses the GTK+ toolkit. It works on most Unix-like operating systems, and is distributed under a BSD license. It is originally based on ircII-EPIC and eventually it was merged into the EPIC IRC client. It supports IPv6, multiple servers and SSL, but not UTF-8. BitchX (often called just "BX" by fans) is well known for its unique default of sending random messages on a /quit.

BitchX2 is the current project. While there is no current release to the public on the new code base, the project is leaning towards merging back to the current base version of Epic.