Great Downloader easy to use can convert into multiple file formats. Fast and impressive
Video DownloadHelper - Browser extension to download videos from the Web
Ant Media Server - Scalable, Ultra Low Latency & Adaptive WebRTC Streaming Ant Media Server provides Scalable Ultra-low latency (0.5 seconds) Adaptive Live Streaming with WebRTC. It supports RTMP, RTSP, Zixi, WebRTC, Adaptive Bitrate, HLS and MP4 recording.
youtube-dl-gui - A cross platform front-end GUI of the popular youtube-dl written in wxPython.
Red5 - Red5 is an open source Flash media server for live streaming solutions of all kinds.
Youtube Video and Audio Downloader - Download YouTube videos in all available formats and extract the original audio files.
MistServer - MistServer is a lightweight, open-source multistandard multimedia server.