Eggplant Functional is a black-box graphical user interface (GUI) test automation tool. It was developed in Boulder, Colorado, by Doug Simons, Jonathan Gillaspie, and John McIntosh. The software was initially developed by Redstone Software, a subsidiary of Gresham Computing PLC, starting in 2002. On September 2, 2008, Redstone Software was acquired by a UK-based company called Testplant, which later rebranded itself as Eggplant.