Great Downloader easy to use can convert into multiple file formats. Fast and impressive
ezgif.com - Ezgif.com is simple online gif maker and toolset for basic animated gif editing.
Video DownloadHelper - Browser extension to download videos from the Web
Instagiffer - Create GIFs from anything!
youtube-dl-gui - A cross platform front-end GUI of the popular youtube-dl written in wxPython.
Gifsicle - Gifsicle is a powerful, simple command line tool for creating, editing, and optimizing animated GIFs.
Youtube Video and Audio Downloader - Download YouTube videos in all available formats and extract the original audio files.