The best Download Manager alternative to NewPipe is yt-dlp, which is both free and Open Source. If that doesn't suit you, our users have ranked more than 100 alternatives to NewPipe and 14 are Download Managers so hopefully you can find a suitable replacement. Other interesting Download Manager alternatives to NewPipe are youtube-dl, Video DownloadHelper, Parabolic and ClipGrab.
Command line program that's a youtube-dl fork that downloads videos from YouTube and over 1000 sites. The main focus of this project is adding new features and patches while also keeping up to date with the original project.
A platform-independent command-line program for downloading videos from YouTube and 1000+ sites. Supports playlists, subtitles, and multiple formats.
Last version was in December 2021. An active fork is 
yt-dlp.
it's multi platform altough GUI-less (but there is wrapper for it)
Browser extension for Chrome and Firefox that allows users to download audio and video files from numerous websites. Detects downloadable content automatically, signals with animated icon, and offers convenient download menu. Includes batch downloads and file conversion.
ClipGrab is a free downloader and converter for YouTube, Vimeo, Metacafe, Dailymotion and many other online video sites.
Tartube is a GUI front-end for youtube-dl, partly based on Youtube-DLG and written in Python 3 / Gtk 3.
SnapTube offers quick, ad-free video and music downloading directly from YouTube in multiple resolutions. It features direct MP3 downloads with no extra encoding or registration required. Manage downloads easily and explore content through keyword search and integrated sharing.
Cross-platform internet download/upload manager for HTTP(S), FTP(S), SSH, magnet-link, BitTorrent, ed2k, and online videos. WebDAV client, FTP client, SSH client.
ytdlp-monkey consists of two scripts for Video websites that work together to provide an accessible menu option to download the current open video. When clicked, it sends the current video's URL to a small local server running yt-dlp (https://alternativeto.
The latest update (v4.0.2) is from January 2023.
I was looking for an (offline) private YouTube player, not a downloader so Downline, which may be a great app, does not fit the bill.
TubeSaver can save HD video for free, perfectly supporting Youtube, Instagram, Facebook, Twitter, Tumblr, Line, Kakao, Musical.ly and other websites.
-Video Downloader & Download Manager -Video Saver & Player for Dropbox and Google Drive -Support: DropBox, GoogleDrive -Video Manager -Import directly from Camera Roll.
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NewPipe it's an app, not a tool same as youtube-dl.