JTL is open source (licensed under EPL 2.0). The source code of JTL is available at GitHub.

JTL is developed by the MDE Group of the Department of Information Engineering, Computer Science and Mathematics (DISIM) of the University of L'Aquila (Italy). Current developers and contributors are:

• Romina Eramo (University of L'Aquila)
• Michele Tucci (University of L'Aquila)
• Alfonso Pierantonio (University of L'Aquila)
• Gianni Rosa (IIS of L'Aquila)