The World Council of Churches on 23 September launched the first online digital library covering theology and ecumenism, called GlobeTheoLib. “The time has come to launch a new model of ecumenical sharing of theological resources in order to prepare world Christianity for the 21st century,” said WCC general secretary the Rev. Olav Fykse Tveit.
Registration is free and straightforward. You then have access to 940,328 documents – and can even add your own.
In the comments it would be useful if you mention online libraries that you find useful.
H/T my good e-friend Jane Redmont