Tgif (pronounced t-g-i-f) is an Xlib-based interactive 2-D drawing tool (using vector graphics) under X11 on Linux and most UNIX platforms (including Mac OS X and cygwin on Windows).

Because Tgif was developed long before a standard way for drawing programs to work, one might find it unfamiliar to use in a number of ways: Tgif saves drawings in a Prolog-based[2] plain text file format.

Originally, it was possible to print Tgif drawings in batch mode without using an X display.

Currently, in order to print drawings, the user would need to be running Tgif on an X display.

This restriction cannot be applied if the drawing only uses Times Roman, Helvetica, Courier, and/or Symbol fonts.