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For those with OGL worries, CRN Games released a bunch of their stuff under CC-BY:
https://web.archive.org/web/20080501100028/http://files.crngames.com/cc/
For those with OGL worries, CRN Games released a bunch of their stuff under CC-BY:
https://web.archive.org/web/20080501100028/http://files.crngames.com/cc/
The third edition of the beloved _The Shadow of Yesterday_ is here: https://www.arkenstonepublishing.net/tsoy
And that version is also CC.