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koreader
An ebook reader application supporting PDF, DjVu, EPUB, FB2 and many more formats, running on Cervantes, Kindle, Kobo, PocketBook and Android devices
Jidoujisho also has a built-in reader, but I haven't tried it yet.
http://read.hibiscus.moe/ and https://reader.ttsu.app/ (github page) have toggles for furigana/ruby text. The Jidoujisho app I mentioned before runs an offline version of ッツ reader, so perhaps it also supports toggling the furigana?
https://bibi.epub.link/ another web reader
If you're on Android check out KOReader, its Japanese text selection algorithm is very good, and can handle conjugated words well. I think you can install KOReaders on kindle devices too, but that requires a jailbroken device.