As mentioned Muvizu is one of a kind within this field as it offered actual 3D scenes, characters, and props. You can also import your own 3D elements into a scene. Motion tracking is easy, 3D camera operation, lip-syncing, and many more features. You don't have to be an animator to build your first scene in minutes.
Great Downloader easy to use can convert into multiple file formats. Fast and impressive
Plotagon - This app, Plotagon. is very fun. Creative and lets me express my ideas and all of my desiors!
Video DownloadHelper - Browser extension to download videos from the Web
FaceRig - FaceRig is a program that aims to enable anyone with a webcam to digitally embody awesome...
youtube-dl-gui - A cross platform front-end GUI of the popular youtube-dl written in wxPython.
MocapX - Facial Motion capture app Maya and iPhone. With the MocapX animator, you can easily use the iPhone camera to animate characters in real time directly in Maya. MocapX tools enable you to use any custom or production rig as well as any Maya feature.
Youtube Video and Audio Downloader - Download YouTube videos in all available formats and extract the original audio files.