Open source licenses are licenses that comply with the Open Source Definition – in brief, they allow software to be freely used, modified, and shared. To be approved by the Open Source Initiative (also known as the OSI) a license must go through the Open Source Initiative’s license review process.

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- 1-clause BSD License
- Academic Free License v. 3.0
- Adaptive Public License 1.0
- Apache License, Version 2.0
- Apache Software License, version 1.1
- Apple Public Source License 2.0
- Artistic License (Perl) 1.0
- Artistic License 1.0
- Artistic License 2.0
- Attribution Assurance License
- BSD+Patent
- Boost Software License 1.0
- CERN Open Hardware Licence Version 2 – Permissive
- CERN Open Hardware Licence Version 2 – Strongly Reciprocal
- CERN Open Hardware Licence Version 2 – Weakly Reciprocal
- CUA Office Public License
- Cea Cnrs Inria Logiciel Libre License, version 2.1
- Common Development and Distribution License 1.0
- Common Public Attribution License Version 1.0
- Common Public License Version 1.0
- Computer Associates Trusted Open Source License 1.1
- Cryptographic Autonomy License
- EU DataGrid Software License
- Eclipse Public License -v 1.0
- Eclipse Public License version 2.0
- Educational Community License, Version 1.0
- Educational Community License, Version 2.0
- Eiffel Forum License, Version 2
- Eiffel Forum License, version 1
- Entessa Public License Version. 1.0
- European Union Public License, version 1.2
- Fair License
- Frameworx License 1.0
- GNU Affero General Public License version 3
- GNU General Public License version 2
- GNU General Public License version 3
- GNU General Public License, version 1
- GNU Lesser General Public License version 2.1
- GNU Lesser General Public License version 3
- GNU Library General Public License version 2
- Historical Permission Notice and Disclaimer
- IBM Public License Version 1.0
- IPA Font License
- ISC License
- Intel Open Source License
- JAM License
- Jabber Open Source License
- LaTeX Project Public License, Version 1.3c
- Lawrence Berkeley National Labs BSD Variant License
- Licence Libre du Québec – Permissive version 1.1
- Licence Libre du Québec – Réciprocité forte version 1.1
- Licence Libre du Québec – Réciprocité version 1.1
- Lucent Public License Version 1.02
- Lucent Public License, Plan 9, version 1.0
- MIT No Attribution License
- MITRE Collaborative Virtual Workspace License
- Microsoft Public License
- Microsoft Reciprocal License
- MirOS License
- Motosoto Open Source License
- Mozilla Public License 1.1
- Mozilla Public License 2.0
- Mozilla Public License, version 1.0
- Mulan Permissive Software License v2
- Multics License
- NASA Open Source Agreement v1.3
- NAUMEN Public License
- NTP License
- Nokia Open Source License Version 1.0a
- Non-Profit Open Software License version 3.0
- OSET Public License version 2.1
- Open Group Test Suite License
- Open Logistics Foundation License v1.3
- Open Software License 2.1
- Open Software License, version 1.0
- OpenLDAP Public License Version 2.8
- PHP License 3.0
- PHP License 3.01
- Python License, Version 2
- RealNetworks Public Source License Version 1.0
- Reciprocal Public License 1.5
- Reciprocal Public License, version 1.1
- SIL OPEN FONT LICENSE
- Simple Public License
- Sun Industry Standards Source License
- Sun Public License, Version 1.0
- The 2-Clause BSD License
- The 3-Clause BSD License
- The CNRI portion of the multi-part Python License
- The European Union Public License, version 1.1
- The MIT License
- The Nethack General Public License
- The OCLC Research Public License 2.0 License
- The Open Software License 3.0
- The PostgreSQL Licence
- The Q Public License Version
- The Ricoh Source Code Public License
- The Sleepycat License
- The Sybase Open Source Licence
- The Universal Permissive License Version 1.0
- eCos License version 2.0