Continuous variable valve timing

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Continuous variable valve timing (CVVT) is an automotive technology that allows the intake and/or exhaust valve timing to be infinitely varied during engine operation. There are no discrete stages for affected components, as in a VTEC-style system.

[edit] Implementations

Alfa Romeo - Double continuous variable valve timing. CVVT is used on inlet and exhaust valves.
BMW - Double VANOS.
BMW/PSA Peugeot Citroën - Continuous variable valve timing (CVVT)
Chrysler - dual Variable Valve Timing (dual VVT). Used on Chrysler GEMA "World" engine.
Daihatsu - Dynamic variable valve timing (DVVT)
Ford - Variable valve timing (VVT)
General Motors - Continuous variable valve timing (CVVT)
Geely - Continuous variable valve timing (CVVT)
Honda - The i-VTEC system uses VTC (Variable Timing Control) to provide continuous timing variation of the intake camshaft on DOHC i-VTEC engines.
Hyundai/Kia - Continuous variable valve timing (CVVT) - debuted in the 2.0 L Beta I4 in 2005 in the Hyundai Elantra, Kia Spectra, and the Kia Rio. Also present in 2006 Accent and Tiburon ,Hyundai Sonata and Hyundai Getz
Mitsubishi - MIVEC system for the 4B1 engine family - intake and exhaust cam timing is continuously and independently controlled
MG Rover - Variable Valve Control (VVC)
Nissan - Continuous Variable Valve Timing Control System (CVTCS). The ECU adjusts the engine's timing continuously to prevent detonation/pinging and optimize gas mileage.
Porsche - VarioCam and VarioCam Plus.
Toyota - Variable Valve Timing with intelligence (VVT-i), Variable Valve Timing with Lift and Intelligence (VVTL-i).
Volvo - Continuous variable valve timing (CVVT)