Nimble Streamer is described as 'server software for streaming media content. ~ Input live protocols: RTMP, RTSP, SRT, MPEGTS, Icecast, HLS. ~ Live output: HLS, MPEG-DASH, RTMP, RTSP, SRT, MPEGTS, Icecast, SLDP' and is an app in the Network & Admin category. There are more than 10 alternatives to Nimble Streamer for a variety of platforms, including Linux, Windows, Mac, Self-Hosted solutions and Online / Web-based. The best alternative is YouPHPTube, which is both free and Open Source. Other great apps like Nimble Streamer are MistServer (Paid, Open Source), Octopus (Free, Open Source), Flussonic (Paid) and Ant Media Server (Paid, Open Source).
The open source video transcoding and delivering platform based on Drupal. This will provide you ability to quickly set up a video platform like Youtube using self hosted Ffmpge or using Zencoder video transcoder.
Ant Media Server is a streaming engine software that provides adaptive, ultra-low latency streaming by using WebRTC technology with 0.5 seconds latency. Ant Media Server is highly scalable both horizontally and vertically.
Kurento Media Server provides, out of the box, group communications, mixing, transcoding, recording and playing. In addition, it also provides advanced modules for media processing including computer vision, augmented reality, alpha blending and much more.