For mobile Movies & TV apps, jump to the Movies & TV section of the megathread.
Lucky Patcher - Unlocks in-app purchases on Android apps and removes ads.
Tachiyomi - Manga reader
nzb360 - Usenet and torrent remote management app with support for managing Sonarr / Radarr / Lidarr / Bazarr / Sickbeard / Couchpotato / Headphones
iTorrent Search - Torrent search app for Android
iDope Torrent Search - Torrent search app for Android
Libgen for Android - Libgen search/download app
Librebook for Android - Libgen search/download app
See /r/ApksApps for more Android apps
See /r/moddedandroidapps for more Android apps
See /r/sideloaded for iOS
Freezer - Streaming and downloading app for Deezer.
AIDS - Android app for downloading mp3/FLAC from Deezer. Replacement for deezloader
Fildo - Android app for downloading and streaming music.
Newpipe - Watch and download youtube videos. Also offers ability to download from soundcloud.
ReVanced - Ad-free youtube, supports background play. Modded version of the official youtube app.
YMusic - Youtube Music player and downloader
LibreTorrent - Ad-free, open-source torrent client for Android.
Flud - Popular torrent client for Android.
aTorrent - Popular torrent client for Android.
Transdrone - Remote torrent management app for your torrent client running on your main PC. Supports several torrent clients
nzb360 - Remote torrent management app with support for managing Sonarr / Radarr / Lidarr / Bazarr / Sickbeard / Couchpotato / Headphones
apkmirror.com - Contains untouched and signed release apks. Useful if searching for a prior version of an application.
apkpure.com - Similar to apkmirror.com
apps.evozi.com/apk-downloader - Play Store APK downloader
PlaystoreDownloader - Play Store APK downloader
Mobilism for Android - Mobilism's app to browse their cracked apps & ebook catalogue
Mobilism - Mobilism's app to browse their cracked apps & ebook catalogue