Project Euclid is an online publishing service with a mission to advance scholarly communication in the fields of theoretical and applied mathematics and statistics. It is designed to address the unique needs of low-cost independent and society journals. Through a collaborative partnership arrangement, these publishers join forces and participate in an online presence with advanced functionality, without sacrificing their intellectual or economic independence or commitment to low subscription prices. Project Euclid runs on DPubS (Digital Publishing System) open source software, conceived by Cornell University Library (CUL) and developed jointly by the Library and the Penn State University Libraries and Press with funding from the Andrew W. Mellon Foundation. Project Euclid itself was developed and deployed by the CUL with start-up funding from the Andrew W. Mellon Foundation and is jointly managed by CUL and the Duke University Press.