LinuxMCE is a whole home automation suite.
It the 'digital glue' between your media and all of your electrical appliances.
It includes full featured solutions for:

Media

• Organize media with special metadata tags
• View/Listen to media in any room
• Media automatically follows you through your home
• New media is automatically detected - even if it's on other devices like another computer on your network or Network Attached Storage (NAS)
• Control all your A/V gear through LinuxMCE
• (using HDMI-CEC, IR, USB, Ethernet, or RS-232) including automatically powering everything on and setting the proper inputs on each device

Security

• Monitor sensors and trigger events
• Monitor security cameras

Telecomunication

• Use VoIP phones anywhere in your home with minimal setup
• Voicemail, call forwarding, advanced caller ID

Network Management

• Take the place of a standard home router
• Advanced firewall
• Advanced Quality of Service (QoS) to make sure your bandwidth is used effectively 
• (especially important for VoIP)
• Manage networked storage (such as NAS devices)

Home Control and Automation

• Control climate and lighting throughout your entire home

LinuxMCE provides all this functionality by controlling 

all kinds of devices throughout the home including:

• LinuxMCE Core Computer
• LinuxMCE Media Director Computers
• LinuxMCE Orbiters (Fancy remotes)
• Nokia 770/N800/N810
• Various PDAs (such as IPAQ 5550 and IPAQ hx2410)
• Various Bluetooth capable mobile phones
  (including Nokia E65, N70, N73, 6620, 7650)
• The Web Orbiter
• Various other devices
• Networked storage (including Network Attached Storage (NAS) Devices)
• A/V Equipment (TVs, Receivers, Cable Boxes, etc)
• HDMI-CEC
• Using Infrared (IR)
• Using RS-232 (Serial)
• Using Ethernet (Network)
• Using USB
• TV Capture Devices
• Lighting Automation
• Using X10
• Using Z-Wave
• Using Insteon
• Using various other protocols
• See also: Automation
• HVAC (Climate Control)Automation
• Security Systems or Individual Sensors
• Surveillance Cameras (IP, Firewire, video capture board, etc)
• VoIP Phones and Service Providers