Android

Aptoide is a distributed marketplace for mobile applications which runs on the Android operating system.

Amaze File Manager is an intuitive, open-source file manager for Android that's both free and ad-free (no upgrade offers, no popups, no ads at all). It's based on Material Design guidelines so it sits very nicely alongside the stock Android experience from Google and being open-source, concerns about privacy and security, should they exist, can easily be addressed.

FEATURES

• No ads at all
• Lightweight and super fast
• Based on Material Design guidelines
• Basic features like cut, copy, delete, compress, extract etc. easily accessible
• Work on multiple tabs at same time
• Multiple themes with cool icons
• Navigation drawer for quick navigation
• App Manager to open, backup, or directly uninstall any app
• Quickly access history, access bookmarks or search for any file
• Root explorer for advanced users

F-Droid is an installable catalogue of FOSS (Free and Open Source Software) applications for the Android platform.

Yalp Store lets you download apps from Google Play Store as apk files. It can search for updates of installed apps and lets you search for other apps. Yalp saves downloaded apks to your default download folder. Other features include browsing categories, viewing and leaving reviews, black/white-listing apps for updates, filtering apps by being free/paid and containing/not containing ads.

To supplement the features related to Google Play, Yalp Store has ordinary package manager features: listing, running, installing and uninstalling local apps.

If root is available, Yalp Store can update your apps in background, install and uninstall system apps.

By default Yalp Store connects to Google services using a built-in account, so you do not have to own a Google account to use it. The only reason to use a live Google account is to access the paid apps you own.

andOTP is a two-factor authentication App for Android 4.4+.

It implements Time-based One-time Passwords (TOTP) like specified in RFC 6238.
Simply scan the QR code and login with the generated 6-digit code.

This is a fork of the great OTP Authenticator app written by Bruno Bierbaumer, which has sadly been inactive since 2015. All credit for the original version goes to Bruno.

Features:

• Free and Open-Source
• Requires minimal permissions
• Camera access for QR code scanning
• Storage access for import and export of the database
• Encrypted storage
• Plain-text backups
• Encrypted backups using OpenPGP
• Sleek minimalistic Material Design
• Great Usability
• Compatible with Google Authenticator

F-Droid - https://f-droid.org/packages/org.shadowice.flocke.andotp/
GitHub - https://github.com/flocke/andOTP/releases

NewPipe is a lightweight YouTube front-end for Android.

It doesn't need the YouTube-API or any Google Play Services, as NewPipe only parses the YouTube website in order to gain the information it needs.
Therefore this app can be used on devices without Google Services installed. Also, you don't need a YouTube account to use NewPipe, and it's FLOSS.

Features

Search videos
Display general information about a video
Watch YouTube videos
Listen to YouTube videos (experimental)
Select the streaming player to watch the video with
Download videos
Download audio only
Open a video in Kodi
Show Next/Related videos
Search YouTube in a specific language
Watch age restricted material
Display general information about channels