The Bell 206 stock helicopter which comes with Xplane is a great helicopter and its free. Xplane has a great rotorcraft flight model and the helicopters which come with the base package are excellent.
The Bell 206 handles similar to other payware helicopters and is a challenge to fly. The graphics aren't too bad either.
3D Cockpit and TRACKIR support to make things more authentic are available too.
The Bell 206 is a family of two-bladed, single- or twin-engined helicopters, manufactured by Bell Helicopter at its Mirabel, Quebec plant. Originally developed as the Bell YOH-4 for the United States Army's Light Observation Helicopter program, it was not selected by the Army. Bell redesigned the airframe and successfully marketed the aircraft commercially as the five-place Bell 206A JetRanger. The new design was eventually selected by the Army as the OH-58 Kiowa. Bell also developed a seven-place LongRanger, which was later offered with a twin-engined option as the TwinRanger, while Tridair Helicopters offers a similar conversion of the LongRanger called the Gemini ST. The ICAO-assigned model designation "B06" is used on flight plans for the JetRanger and LongRanger, and the designation "B06T" is used for the twin-engined TwinRangers.