 Although GNATS is still in use, development slowed since the 4.1 release in 2005.Several changes lingered in the developers' source code repository, and a 4.2 release was discussed in 2012 but no official release was made until some further development, leading to release 4.2.0 on the 28th of February 2015.Built as a client-server architecture, GNATS works with many interfaces (described below) including email, command line, and web interfaces.