Great Downloader easy to use can convert into multiple file formats. Fast and impressive
Video DownloadHelper - Browser extension to download videos from the Web
Savesubs - Savesubs is an online service providing a website that persuades you to download subtitles of any video and helping you to make independent from language restriction.
youtube-dl-gui - A cross platform front-end GUI of the popular youtube-dl written in wxPython.
YIFY Subtitles - YIFY Subtitles is a SaaS platform that encourages you to download the subtitles of videos that are present on any social media account like YouTube, Instagram, Twitter, Viki, and Daily Motion.
Youtube Video and Audio Downloader - Download YouTube videos in all available formats and extract the original audio files.
OpenSubtitles.org - OpenSubtitles.org was developed for easy downloading and uploading subtitles for movies.