Great Downloader easy to use can convert into multiple file formats. Fast and impressive
Video DownloadHelper - Browser extension to download videos from the Web
Youtube Trimmer - Youtube Trimmer is a robust and free-to-use online tool that is helping you out to trim YouTube videos up to any certain length.
youtube-dl-gui - A cross platform front-end GUI of the popular youtube-dl written in wxPython.
TubeChop - TubeChop allows you to easily chop a funny or interesting section from any YouTube video and share it.
Youtube Video and Audio Downloader - Download YouTube videos in all available formats and extract the original audio files.
YT Cutter - YT Cutter is a free-to-use online tool that is making your life easy in cutting the videos to any length with high quality.