so many soft starters is available in market.fews are abb
siemens,power boss etc.soft startesused to minimise the
starting time of a motor and limit the current also.in
starting time aalso we  limit the input voltage of the motor.
Ramp Up	 
Ramp Down	
Pedestal	
Step Down 
Supply Frequency
Current Limit Time
Current Limit Level
Kick Start Time
Kick Start Level
Arc-less Switching above all parameters also we adjustable n
soft starters.

Soft starters nothing but thyristor control starters,this 
different form VFD drives,All VFD drives are soft starters 
but All soft starters are not Drives,In VFD we can adjust 
the speed,Torque & master-slave operation,But in soft 
starters is used only to reduse starting current of motor 
And for soft starting of motors.

Soft starters are used for reducing starting currents of
high capacity motors( above 60 HP ). Ofcourse, these are now
a days used with SCR's.