 GNATS was written by Heinz G. Seidl of Cygnus Solutions, inspired by BSD Unix's sendbug and filebug programs, and had its first stable release in 1992.Initially, its only interface was via email, but multiple web and graphical interfaces were later added.During the 1990s, other Cygnus employees rewrote it, and a further major rewrite was done for release 4, with other features contributed by users.