Equalizer, Bass Boost, Volume Booster, and Virtualizer for your phone that follows Google's Material Design.
You can control the Equalizer FX, Bass Boost, Sound Boost, and Virtualizer independently, which means you don't need to enable EQ to enable Bass Boost.

Folder Player Pro is a directory and file-centric music\mp3 player and is a more advanced version of its popular free counterpart.

PRO Librera Reader is an easy to use and highly configurable reading app that supports most popular document formats, including: PDF, EPUB, EPUB3, MOBI, DjVu, FB2, FB2.
zip, TXT, RTF, AZW, AZW3, CBR, CBZ, HTML, XPS, MHT and more. With its simple, yet powerful interface, Librera Reader makes document reading a true pleasure. Librera even features a unique auto-scrolling, hand-free music mode.

File Manager + is easy and powerful file explorer for Android devices.
It's free, fast and full-featured. Because of its simple UI, it's extremely easy to use. With File Manager +, you can easily manage your files and folders on your device, NAS(Network-attached storage), and cloud storages. What's more, you can find how many files & apps you have on your device at a glance immediately after opening File manager +.

Your Places. Your Phone. Your Story. Your phone is the most personal thing you own. You check it a hundred times a day. What do you see? Cartogram turns the places that matter to you into stunning wallpapers made from real Google Maps data.

The program is designed specially for playing audio books.
Assumed that you have audiobooks and already copied them to your phone.

Mstudio is the most advanced & amazing Music Editor! This gives you enhanced control and professional audio editor features with Mp3 cutter, Mp3 Player, Mp3 Merger, Mp3 Mixer, Mp3 Extractor, Change Tempo, Change Pitch, Mp3 Converter, Mp3 Mutter, Mp3 Omitter, Mp3 Splitter.
It's a music center which has all the features which you ever want in a single application.

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Reverso is the one-in-all tool to get a high-quality translation and continuously improve your language skills.
The best part about the Reverso app? It is available for free. Teachers or translators, students, or business professionals, beginners, or advanced learners use Reverso to enrich their vocabulary and read, write, and speak with more accuracy and confidence.

Print photos and share them with family and friends. Print documents, PDF files, invoices, receipts, boarding passes, and more at home, at work, or while on the go! You can print images, photos, web pages, PDF and Microsoft Office documents without downloading any additional apps or printing tools anytime anywhere on almost any WiFi, Bluetooth, or USB printer.or USB printer.