List of trademarked open-source software
This is a list of free/open-source software whose names are covered by registered trademarks. As many countries provide some form of basic protection for unregistered trademarks, nearly any free or open-source software title may be trademarked under common law. This list covers software whose trademarks are registered under a country's intellectual property body.
| Name | Trademark holder | Date filed |
| BitTorrent | BitTorrent, Inc. | September 12, 2004 |
| Blender | Blender Foundation | February 17, 2013 |
| Debian | Software in the Public Interest | November 7, 1997 |
| Draw Freely | Software Freedom Conservancy | February 23, 2009 |
| DRBD | LINBIT Information Technologies | February 4, 2005 |
| Drizzle | Software in the Public Interest | August 3, 2012 |
| Drupal | Dries Buytaert | December 14, 2006 |
| Ethereal | Ethereal, Inc. | March 10, 2003 |
| Evergreen | Software Freedom Conservancy | January 23, 2007 |
| Finnix | Ryan Finnie | August 17, 2006 |
| FreeBSD | FreeBSD Foundation | July 6, 1994 |
| Gentoo | Gentoo Technologies, Inc. | November 4, 2003 |
| Git | Software Freedom Conservancy | June 17, 2013 |
| GNOME | GNOME Foundation | February 7, 2002 |
| GNU | Free Software Foundation | July 25, 2011 |
| Hadoop | Apache Software Foundation | July 21, 2011 |
| Kodi | XBMC Foundation | May 16, 2014 |
| ImageMagick | ImageMagick Studio LLC | November 27, 2003 |
| Inkscape | Software Freedom Conservancy | February 17, 2009 |
| Jenkins | Software in the Public Interest | October 14, 2011 |
| Joomla | Open Source Matters | July 9, 2007 |
| jQuery | Software Freedom Conservancy | October 4, 2011 |
| KDE | KDE e.V. | September 1, 2003 |
| Linux | Linus Torvalds | August 15, 1994 |
| LSB | Linux Foundation | June 24, 2002 |
| midPoint | Evolveum | July 7, 2016 |
| Mifos | Software Freedom Conservancy | December 10, 2004 |
| MinGW | Software in the Public Interest | July 23, 2013 |
| Mozilla Firefox | Mozilla Foundation | December 22, 2003 |
| Mozilla Thunderbird | Mozilla Foundation | September 20, 2006 |
| Mycroft | Mycroft AI Inc. | October 24, 2017 |
| MySQL | Oracle America | July 6, 2001 |
| NetBSD | The NetBSD Foundation | April 20, 2004 |
| Nmap | Insecure.Com LLC | December 18, 2003 |
| OpenOffice.org | Oracle America | October 15, 2006 |
| OpenStack | OpenStack Foundation | September 24, 2013 |
| OpenStreetMap | OpenStreetMap Foundation | February 11, 2013 |
| OpenSUSE | Novell | August 13, 2012 |
| OpenWrt | Software in the Public Interest | May 12, 2014 |
| ownCloud | ownCloud, Inc. | November 16, 2011 |
| Perl | Yet Another Society | January 27, 2005 |
| phpMyAdmin | Software Freedom Conservancy | November 14, 2013 |
| pkgsrc | The NetBSD Foundation | July 6, 2004 |
| Python | Python Software Foundation | May 5, 2005 |
| Qt | Nokia | February 1, 2001 |
| ReactOS | ReactOS Foundation | February 20, 2008 |
| Selenium | Software Freedom Conservancy | January 16, 2014 |
| Sendmail | Sendmail, Inc. | March 13, 1998 |
| SpamAssassin | Apache Software Foundation | July 30, 2002 |
| Subversion | Apache Software Foundation | February 13, 2006 |
| Sugar on a Stick | Software Freedom Conservancy | January 14, 2010 |
| Tor | The Tor Project, Inc. | May 3, 2007 |
| TriSano | Collaborative Software Initiative | July 29, 2008 |
| Ubuntu | Canonical Ltd. | May 24, 2013 |
| VNC | RealVNC | June 6, 2007 |
| Wine | Software Freedom Conservancy | July 31, 2007 |
| Wireshark | Gerald Combs | July 10, 2006 July 13, 2006 |
| XBMC | XBMC Foundation | May 16, 2014 |
| XFS | Silicon Graphics, Inc. | July 11, 2002 |
| XigmaNAS | Michael Zoon | September 11, 2018 |