Great Downloader easy to use can convert into multiple file formats. Fast and impressive
Video DownloadHelper - Browser extension to download videos from the Web
Scrivener - Scrivener is a content-generation tool for composing and structuring documents.
youtube-dl-gui - A cross platform front-end GUI of the popular youtube-dl written in wxPython.
Celtx - Celtx is a scriptwriting software platform with applications in a wide range of mediums but that specializes in helping screenwriters.
Youtube Video and Audio Downloader - Download YouTube videos in all available formats and extract the original audio files.
Trelby - The free, multiplatform, feature-rich screenwriting program!