OSr

OSR is an acronym that can refer to several concepts depending on the context. The two most common meanings are Open Source Software and the Old School Renaissance in tabletop role-playing games.

Open Source Software refers to software released with source code that can be viewed, modified, and redistributed by anyone, under licenses that comply with the Open Source Definition. Notable OSI-approved licenses include the GNU General Public License (GPL), MIT, and Apache licenses. OSR in this sense describes a broad movement and ecosystem rather than a single project, emphasizing transparency, collaborative development, and community governance. Open source software ranges from operating systems and web servers to libraries and applications, with benefits such as peer review, security through visibility, and reduced vendor lock-in. Debates in the field often center on licensing compatibility, sustainability, and governance models.

Old School Renaissance, in tabletop role-playing games, denotes a movement that seeks to recreate or emulate the feel of early RPG play and design. OSR emphasizes exploration, resource management, danger, and open-ended play, often guided by retro-clone games that are compatible with or inspired by early editions of Dungeons & Dragons. Examples include retro-clone products and games like OSRIC (Old School Reference and Index Compilation) and Swords & Wizardry. The OSR has fostered online communities, fan-created adventures, and modular rule sets that encourage sandbox play and quick content creation. Critics sometimes view it as niche or nostalgic, while supporters see it as a means to preserve classic gaming experiences and foster inventive play.

In summary, OSR most commonly denotes either Open Source Software or Old School Renaissance, with different communities using the same acronym to discuss distinct domains.