Great Downloader easy to use can convert into multiple file formats. Fast and impressive
Video DownloadHelper - Browser extension to download videos from the Web
Regard3D - Regard3D is a free, multiplatform, open-source structure-from-motion application.
youtube-dl-gui - A cross platform front-end GUI of the popular youtube-dl written in wxPython.
ContextCapture - Acute3D develops breakthrough photogrammetry software solutions to automatically turn photos into photorealistic high resolution 3D models
Youtube Video and Audio Downloader - Download YouTube videos in all available formats and extract the original audio files.
RealityCapture - RealityCapture is a software solution which automatically produces high resolution 3D models from photographs or laser-scans.