Can you explain me only participants from the white list can participate in ICO or without prior registration investors will be able to participate as well?
There is no ICO for this project. No pre-mine either. Project is funded from a small percentage that comes off every block that is found. Reward starts at 6% and descends as time goes on, which is a great idea to help prove that the Devs are actually interested in making a solid project and not just running with the pre-mine when the price climbs

How is it different from other projects?
Ombre is a privacy coin with low fees and fast transaction times. It uses mixins and ringCT to ensure privacy. Devs are focused and have a great road-map planned. It has a unique funding strategy and has a great future.