• Nextcloud. Keep everything under control: Contacts, calendars, tasks, files, documents… whatever you want.

• F-Droid
• Aurora

• AndOTP (100% opensource)

• DAVx5 (Mandatory if you use nextcloud)

• K9 Mail
• Zoho Mail (only if you use zoho.com mail of course)

• Etar

• Simple Gallery pro

• Keepassdroid (Recommended If you want to use 100% opensourced apps)
• KeePassDX (Simple but powerful)
• keepass2android (recommended, use aurora to install it)

• Newpipe

• VLC (of course)

OLD: https://telegram.org/android → Use their own APK, not the google play one which is limited (read their own disclaimer in the linked page) FUcING PREMIUM AND all their SHT!!!!!!!!!!!!!!!!!!!!!!!!!

FOSS (free and opensource software) alternatives:

• https://github.com/Forkgram (recommended, it has anti-premium features)
• https://github.com/Telegram-FOSS-Team/Telegram-FOSS

• LuckyPatcher (got root? )

• Tor browser (tor surfing the world)
• Tor "vpn" (everything through tor)
• Tracker Control the best application to block write here the big-brother you want on any application with 100% customizable settings (will be a bit hardcore at the beginning)