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Jidoujisho also has a built-in reader, but I haven't tried it yet.
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CodeRabbit
CodeRabbit: AI Code Reviews for Developers. Revolutionize your code reviews with AI. CodeRabbit offers PR summaries, code walkthroughs, 1-click suggestions, and AST-based analysis. Boost productivity and code quality across all major languages with each PR.
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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?
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https://bibi.epub.link/ another web reader
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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
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.