How can I remotely stream videos to my tablet?

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http://askubuntu.com – I'd like to be able to watch my videos that I keep on my desktop running Ubuntu 12.04.2 on my tablet (Nexus 7) when they're connected to different networks. For example, when I'm at my girlfriend's house, and I've left my computer running at home. Can anybody either walk me through how to set this up, or recommend an app that will do this for me? I'd prefer a free option if possible! I tried Plex Media Server, but I can't access the in-browser manager any more for some reason... (HowTos)