Apps similar to Wikisource Reader include Myne (eBook), which is free and open source. Other options are Wikisource. Between them they cover the web and Android.
Myne is a FOSS Android application to download ebooks from the Project GutenBerg, it uses GutenDex API to fetch metadata of ebooks in the backend.
Wikisource is an online digital library of free content textual sources on a wiki, operated by the Wikimedia Foundation. Wikisource is the name of the project as a whole and the name for each instance of that project (each instance usually representing a different language);...
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