this post was submitted on 09 Oct 2025
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Traveller
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Discussion of the various incarnations on the Traveller RPG by Marc Miller, et al.
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Yet another option (pay what you want) is the Cepheus Engine SRD:
https://www.drivethrurpg.com/en/product/186894/cepheus-engine-system-reference-document
How do those compare? It's just some license hell or a different approach?
Mongoose was an OGL approach, hence the SRD. However with all the fuckery regarding OGL they switched to a different approach and now have two affiliate programs that allow anyone to publish their own supporting content.
Haven’t delved too deep trying to find differences. From what I can tell, Cepheus Engine is pretty much the Traveller SRD.
According to this blog, CE also took bits from other SRDs: http://theotherside.timsbrannan.com/2022/05/review-traveller-and-cepheus-srds.html?m=1