MediaTomb is described as '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' and is an app in the Video & Movies category. There are more than 25 alternatives to MediaTomb for a variety of platforms, including Windows, Mac, Linux, Android and iPhone. The best alternative is Plex, which is free. Other great apps like MediaTomb are Universal Media Server (Free, Open Source), Serviio (Freemium), Infuse (Freemium) and MiniDLNA (Free, Open Source).
Connect360 automatically indexes your iTunes and iPhoto libraries and shares them to your Xbox 360. You can then use the Xbox 360 Dashboard to browse and play your media, organized in the exact same way that it is on your Mac.