The Open Siddur is a volunteer-driven, non-profit, non-denominational, and non-prescriptive community project growing a vast collection of digitized Jewish prayers, liturgies, and related works (historic and contemporary, familiar and obscure), composed in every era, region, and language Jews and other Israelites have ever prayed. Our goal is to provide those working with the content of Jewish devotional practice (e.g. for those crafting prayerbooks סִדּוּרִים ⋅ siddurim), a platform for accessing and disseminating text, tools, and resources shared under libre/open terms for creative reuse. Through this we hope to empower personal autonomy, to preserve customs, to cross-pollinate wisdom, and to foster openness and vitality in religious culture.