Open source software products have special licenses that states that this product's source code is available for anyone to use. Any one can download the code to review it, edit it, and use it for their own needs.
Usually most licenses gives the user the full freedom to use the code without having to pay any fees, the user can use the code for personal use or redistribute it again as commercial or non-commercial distribution.
However some don't give this full freedom to the users, or only allow personal and non-commercial distribution. Such licenses require more restrictions like a requirement to preserve the name of the authors and a copyright statement within the code. Open source focus more on the availability of the source code and the freedom of using it
The following is a list of open source licenses approved by OSI based on their open source definition:
License that are popular and widely used or with strong communities
- Apache License, 2.0 (Apache-2.0)
- BSD 3-Clause "New" or "Revised" license (BSD-3-Clause)
- BSD 3-Clause "Simplified" or "FreeBSD" license (BSD-2-Clause)
- GNU General Public License (GPL)
- GNU Library or "Lesser" General Public License (LGPL)
- MIT license (MIT)
- Mozilla Public License 2.0 (MPL-2.0)
- Common Development and Distribution License (CDDL-1.0)
- Eclipse Public License (EPL-1.0)
Special purpose licenses
- Educational Community License
- IPA Font License (IPA)
- NASA Open Source Agreement 1.3 (NASA-1.3)
- Open Font License 1.1 (OFL-1.1)
Other/Miscellaneous licenses
- Adaptive Public License (APL-1.0)
- Artistic license 2.0 (Artistic-2.0)
- Open Software License (OSL-3.0)
- Q Public License (QPL-1.0)
- zlib/libpng license (Zlib)
Licenses that are redundant with more popular licenses
- Academic Free License (AFL-3.0)
- Attribution Assurance Licenses (AAL)
- Eiffel Forum License V2.0 (EFL-2.0)
- Fair License (Fair)
- Historical Permission Notice and Disclaimer (HPND)
- Lucent Public License Version 1.02 (LPL-1.02)
- The PostgreSQL License (PostgreSQL)
- University of Illinois/NCSA Open Source License (NCSA)
- X.Net License (Xnet)
Non-reusable licenses
- Apple Public Source License (APSL-2.0)
- Computer Associates Trusted Open Source License 1.1 (CATOSL-1.1)
- CUA Office Public License Version 1.0 (CUA-OPL-1.0)
- EU DataGrid Software License (EUDatagrid)
- Entessa Public License (Entessa)
- Frameworx License (Frameworx-1.0)
- IBM Public License (IPL-1.0)
- LaTeX Project Public License (LPPL-1.3c)
- Motosoto License (Motosoto)
- Multics License (Multics)
- Naumen Public License
- Nethack General Public License (NGPL)
- Nokia Open Source License (Nokia)
- OCLC Research Public License 2.0 (OCLC-2.0)
- PHP License (PHP-3.0)
- Python License (Python-2.0) (overall Python license)
- CNRI Python license (CNRI portion of Python License)
- RealNetworks Public Source License V1.0 (RPSL-1.0)
- Ricoh Source Code Public License (RSCPL)
- Sleepycat License (Sleepycat)
- Sun Public License (SPL)
- Sybase Open Watcom Public License 1.0 (Watcom-1.0)
- Vovida Software License v. 1.0 (VSL-1.0)
- W3C License (W3C)
- wxWindows Library License (WXwindows)
- Zope Public License (ZPL-2.0)
Superseded licenses
- Apache Software License 1.1
- Common Public License 1.0
- Artistic license 1.0
- Eiffel Forum License V1.0
- Lucent Public License (Plan9)
- Mozilla Public License 1.1 (MPL 1.1)
- Mozilla Public License 1.0 (MPL 1.0)
- Open Software License 1.0
- Reciprocal Public License
Licenses that have been voluntarily retired
- Intel Open Source License
- Jabber Open Source License
- MITRE Collaborative Virtual Workspace License (CVW License)
- Sun Industry Standards Source License (SISSL)
Uncategorized Licenses
- Boost Software License (BSL1.0)
- Common Public Attribution License 1.0 (CPAL)
- European Union Public License (EUPL-1.1) (links to every language's version on their site)
- GNU Affero General Public License v3 (AGPL-3.0)
- ISC License (ISC)
- Microsoft Public License (MS-PL)
- Microsoft Reciprocal License (MS-RL)
- MirOS Licence (MirOs)
- Non-Profit Open Software License 3.0 (NPOSL-3.0)
- NTP License (NTP)
- Reciprocal Public License 1.5 (RPL-1.5)
- Simple Public License 2.0 (Simple-2.0)
- Open Group Test Suite License (OGTSL)
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