Kallithea is a project of the Software Freedom Conservancy, Inc. and is released under the terms of the GNU General Public License, v 3.0 (GPLv3).

Kallithea is copyrighted by various authors, including but not necessarily limited to the following:

• Copyright © 2010–2013, RhodeCode GmbH
• Copyright © 2011–2015, Unity Technologies
• Copyright © 2012, 2014–2015, Andrew Shadura
• Copyright © 2012, Augusto Herrmann
• Copyright © 2012, Dan Sheridan
• Copyright © 2012, 2014–2015, Dominik Ruf
• Copyright © 2012, Vincent Duvert
• Copyright © 2011, Liad Shani
• Copyright © 2013, Jonathan Sternberg
• Copyright © 2011, Jason F. Harris
• Copyright © 2011, Lorenzo M. Catucci
• Copyright © 2013, Grzegorz Rożniecki
• Copyright © 2011, Les Peabody
• Copyright © 2011, Nicolas VINOT
• Copyright © 2012, Indra Talip
• Copyright © 2012, H Waldo G
• Copyright © 2011, Aparkar
• Copyright © 2013, Dennis Brakhane
• Copyright © 2011, Matt Zuba
• Copyright © 2014, Bradley M. Kuhn
• Copyright © 2012–2013, xpol
• Copyright © 2012, hppj
• Copyright © 2013–2015, Takumi IINO
• Copyright © 2011, Shawn K. O'Shea
• Copyright © 2012, Tony Bussieres
• Copyright © 2011, Simon Lopez
• Copyright © 2012, mikespook
• Copyright © 2012, nansenat16
• Copyright © 2012, Zachary Auclair
• Copyright © 2012, Raoul Thill
• Copyright © 2011, Jared Bunting
• Copyright © 2013, Magnus Ericmats
• Copyright © 2010, Łukasz Balcerzak
• Copyright © 2014–2015, Sean Farley
• Copyright © 2014, Martin Vium
• Copyright © 2014, Daniel Anderson
• Copyright © 2014, Travis Burtrum

The above are the copyright holders who have submitted direct contributions to the Kallithea repository. In the Kallithea source code, there is a list of third-party libraries and code that Kallithea incorporates.