The Minecraft section is available mostly for historic purposes now. Some of it may be reimplented later if something gets arranged.
The Dota 2 section currently only contains a 'Leaderboard of Losses'. An example of pulling statistics from OpenDota and displaying them in plain text, prettied up with some font.
The Mumble section contains an in-browser client for The Guys Gaming Mumble voice server. Go here if you don't want to install a Mumble client.
The Stream section will eventually lead to a browser viewer for a video stream. Nothing is available there yet.