Great Downloader easy to use can convert into multiple file formats. Fast and impressive
Video DownloadHelper - Browser extension to download videos from the Web
Online Convert - Convert files like images, video, documents, audio and more to other formats with this free and fast online converter.
youtube-dl-gui - A cross platform front-end GUI of the popular youtube-dl written in wxPython.
Zamzar - Free conversion online of many type of documents (images, text, video, audio...
Youtube Video and Audio Downloader - Download YouTube videos in all available formats and extract the original audio files.
online2pdf - This Online PDF Converter can convert all your files to PDF but also compress and merge PDF files! Word, Excel, PowerPoint, images and any other kind of document can be easily converted to PDF on Online2PDF.