Yes. It is older than Judaism itself. You find it more in the more orthodox sects and in Chassidic sects in particular. I've had Reform Jews look at me as if I had three heads when I tell them I'm a B'nai Noach; "What in the world is that?". Rambam wrote of B'nai Noachs...“
Anyone who accepts the Seven Laws and is careful to do them, this person is one of the Chasidei Umos HaOlam
(very pious of the nations of the world), and he has portion in the world to come.“. Within those seven laws there are some 66 mitzvahs we follow. This is also why Jews generally do not proselytize, because they don't need to.
Rebbe Menachem Mendel Schneerson or The Rebbe, who was a Chabad rebbe was a great leader when it came to spreading the word about the Noahide Covenant. On March 5th the 102nd Congress signed into law the recognition of The Rebbe on his 89th birthday with Education Day which, among other things states, ...
EDUCATION DAY U.S.A
Public Law 102-14, H.J. Res 104
102nd Congress of the United States of America
March 5, 1991
Whereas Congress recognizes the historical tradition of ethical values and principles which are the basis of civilized society and upon which our great Nation was founded;
Whereas these ethical values and principles have been the bedrock of society from the dawn of civilization, when they were known as the Seven Noahide Laws;
Whereas without these ethical values and principles the edifice of civilization stands in serious peril of returning to chaos;
<snip>
It is also of interest to note that the Noahide Covenant is somewhat of an umbrella faith because other religions fall within it's scope. Muslims practice all seven of the laws. Christians, depending on the sect, follow six or seven of them within their own faith. You will also find many terrible things said about Noahides around the internet. Conspiracy theories that we are the New World Order, it will be the instrument which Satan will use during his time on earth here, under Noahide laws a person will have there head chopped off for any little infraction. All of which is untrue.
If you want to learn more check out these sites:
WikiNoah
Ask Noah