Project Gutenberg is a volunteer-run digital library of public-domain works, and the oldest effort of its kind. It is where the texts on Wordema come from.
Project Gutenberg exists to make books whose copyright has expired freely available to anyone, in plain formats that will still open decades from now. Volunteers transcribe and proofread the texts. The result is tens of thousands of works, free to read, download and share.
Project Gutenberg gives you the words. Wordema gives you a way to read them that suits a phone: one word at a time, held where your eye rests, at a pace you control, with your place kept automatically. Nothing about the text is altered.
If you would rather have the plain file to keep, Project Gutenberg is the right place to go and worth supporting. If you want to read on the device already in your hand, start here.
It means the library is genuinely free rather than free-for-now, and that it grows. Every January, another year of works enters the public domain.