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BookReader: An open-source book reading application. Supported formats: fb2, html, txt, epub, mobi, rtf, doc, pdf, djvu, cbr, cbz.
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Librera Reader: An e-book reader for Android devices; it supports the following formats: PDF, EPUB, EPUB3, MOBI, DjVu, FB2, TXT, RTF, AZW, AZW3, HTML, CBZ, CBR, DOC, DOCX, and OPDS Catalogs.
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Just (Video) Player: A simple and lightweight, yet polished and powerful Android video player based on ExoPlayer, compatible with Android 5+ and Android TV.
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LeafPic: A fluid, material-designed alternative gallery, it also is ad-free and open source under GPLv3 license. It doesn't miss any of the main features of a stock gallery. NO LONGER MAINTAINED.
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MPV: A video player for Android based on libmpv. It features hardware and software video decoding, gesture-based seeking and volume/brightness control, libass support for styled subtitles, and url streaming.
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Music Player GO: A simple yet fully-featured local music player aiming at simplicity and performance.
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Nova Video Player: An open source video player for Android designed for tablets, phones and AndroidTV devices. A fork of the original Archos Video Player Community Edition.
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Photok: a free Photo-Safe. It stores your photos encrypted on your device and hides them from others. It uses technologies like, AES-256 encryption standard or bcrypt, to keep your photos secure. Photok is completely free, open source, and contains no ads.
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Retro Music Player: Material design music player with simple interface and lots of features such as driving mode, smart auto playlists, 30+ language support, lyrics screen (download and sync with music), gapless playback, folder support and more.
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Simple Gallery: A highly customizable lightweight gallery loved by millions of people for its great user experience. Organize and edit your photos, recover deleted files with the recycle bin, protect & hide files and easily view a huge variety of different photo and video formats including RAW, SVG, GIF, panoramic and much more.
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Vinyl Music Player: A material designed local music player for Android. Forked from Phonograph; makes all Pro features free, as they used to be, and has some additional features.
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VLC: A free and open source cross-platform multimedia player and framework that plays most multimedia files as well as DVDs, Audio CDs, VCDs, and various streaming protocols.