Youtube-DLG is described as 'Cross-platform GUI for youtube-dl, enabling video downloads from YouTube and over 1000 sites; features multi-language UI and video cutting' and is a very popular youtube downloader in the audio & music category. There are more than 100 alternatives to Youtube-DLG for a variety of platforms, including Windows, Mac, Web-based, Linux and Android apps. The best Youtube-DLG alternative is youtube-dl, which is both free and Open Source. Other great apps like Youtube-DLG are yt-dlp, Cobalt Tools, Internet Download Manager and Seal.
Download and convert videos from Facebook, DailyMotion, Vimeo to multiple formats. Easy to use interface, and supports conversion for devices like iPhone, Samsung. YouTube downloads are limited to the Pro version.
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.
youtube-dl is outdated, and it's a command line app, not a GUI app like Youtube-DLG.
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.
Privacy-first downloader supporting fast, no-tracking downloads of video, audio, and images from a wide range of social platforms—no account required, open API for free integration, expanding platform support, and no data or analytics collected or stored.
Accelerates downloads using dynamic segmentation, resumes interrupted or broken transfers, integrates with major browsers, supports scheduling, manages categories and download queues, downloads videos, applies skins, offers periodic synchronization, and multiple protocols.
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.
A versatile tool for downloading high-quality videos from a range of leading platforms, supporting playlists, channels, subtitles, and various resolutions. Compatible with major operating systems and allows simultaneous downloading and option for increasing download limits.
Freemake Video Converter is video converter that lets convert videos to avi, wmv, mp4 (iPhone, iPod, iPad, PSP, xBox), 3gp, rip dvd, extract mp3, burn DVD and Bluray, create photo slideshow and audio visualization, cut, join, rotate and upload videos, photos and music to YouTube.
ClipGrab is a free downloader and converter for YouTube, Vimeo, Metacafe, Dailymotion and many other online video sites.
YTDLnis is a free and open source video/audio downloader using yt-dlp for Android 6.0 and above.
Vividl is a Windows app that lets you download videos from various websites, including YouTube.
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Not an alternative, but the core. Rather easy to script it to do various things.