iStream!

Universal Media Server is a media server capable of serving videos, audio and images to any DLNA-capable device.It supports any device capable of DLNA and runs on all major operating systems: Windows, OS X and Linux.

Serviio is a free media server. It allows you to stream your media files (music, video or images) to any DLNA-certified renderer device (e.g. a TV set, Bluray player, games console) on your home network.

MediaTomb is an open source (GPL) UPnP MediaServer with a nice web user interface, it allows you to stream your digital media through your home network and listen to/watch it on a variety of UPnP compatible devices.

A Plex client for the new Apple TV.

SofaPlay allows you to play media files directly from your Mac on the tv. It connects your Mac to your Smart TV and takes care of the streaming. Just drag any movie file onto SofaPlay and it will appear instantly on the big screen in front of you. SofaPlay streams your video wirelessly to your TV.

chrometizer - Cast your local videos

Gerbera is a free UPnP media server forked from the now discontinued MediaTomb project. It's highly compatible and works with many devices including TVs, Playstation, Android & iOS phones and tablets.

What is OpenPlex?

Run your always-on Plex Media Server in the cloud without the need for an always-on PC or network-attached storage device (NAS). With Plex Cloud, you’ll be ready to go in 60 seconds or less, easily streaming and accessing your media remotely on all your Plex enabled devices. Too easy!