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Efraim Feinstein is the lead developer of the Open Siddur web application.

הגדה לסדר פסח | Haggadah for the Passover Seder, with an English translation by Dr. Eve Feinstein
סדר עבודת ישראל (אשכנז)‏ | Seder Avodat Yisroel, a critical text of the Siddur annotated by Isaac Seligman Baer (1868)
Copyright and Commercial Use: the Problem with Creative Commons’ Non-Commercial Use Licenses
Openness, remixability, and free culture (Efraim Feinstein, 2010)
Technology is a “plus” not “or” proposition: thoughts after NewCAJE 2010 by Efraim Feinstein
Efraim Feinstein presents the Open Siddur Project at NewCAJE, 2010
An Economic Argument for Open Data by Efraim Feinstein
Architecture of the Open Siddur
Jewish Content, Free Culture and “Content Compatibility” by Efraim Feinstein
Why all the software? by Efraim Feinstein
Invitation to Young Technologists