ProQuest Dissertations & Theses Open: "PQDT Open provides the full text of open access dissertations and theses free of charge. You can quickly and easily locate dissertations and theses relevant to your discipline, and view the complete text in PDF format."
Theological Reserach Exchange Network (TREN) - "a library of over 21,451 theological thesis/dissertation titles representing research from as many as 139 different institutions." TREN "also makes available conference papers presented at annual meetings of several academic societies." Some of the online content is freely available, other resources are offered at an affordable price.