The Seasteading Institutes goals are to build floating cities to test out various forms of government - it seems a pie in the sky goal.
The Seasteading Institute is a nonprofit 501(c)(3), working to enable seasteading communities - floating cities - which will allow the next generation of pioneers to test new ideas for government. The most successful can then inspire change in governments around the world.
Not technically sea-steading but still with a goal to avoid governing, Blueseed is a big tech start-up and research vessel (also, not yet a reality) that will live off the coast of Silicon Valley.
Blueseed is creating the world’s most amazing upcoming startup community for entrepreneurs, on a cruise ship 12 nautical miles from the coast of San Francisco, in international waters. The location allows startup entrepreneurs from anywhere in the world to launch or grow their companies near Silicon Valley, without the need for a U.S. work visa. The ship will be converted into a coworking and co-living space, and will have high-speed Internet access and daily transportation to the mainland via ferry boat. So far, over 1500 entrepreneurs from 500 startups in 70+ countries have expressed interest in living on Blueseed.
The Freedom Ship is an on-again/off-again project of a floating city that will travel the world, but based off the Florida coast. It's just one big vessel. This once seemed the most likely seasteading project to get off the ground (or on the water) at one point but then it died. There may be some resurrection going on. It a really really big cruise ship is all - too big for any international port. With all the recent illnesses that have spread through cruise ships - this whole concept seems overblown.
It seems the missions are all attempting to avoid all governance. I suppose if you have the money to go reside in international waters out from under the long arm of any laws and want to do that, so bit it, but I don't think it's a worthy cause risking the health of our oceans. The sea is not really meant for us to live and colonize on it's surface. On the other hand colonizing or homesteading the oceans could begin to build a worldwide policy foundation that will be necessary when we start to colonize the space.