Gab - Free speech social network Gab launched in August 2016 as a private beta and opened up registrations to the public in May 2017. Gab states that "any user's political speech that is protected by the First Amendment of the U.S". Constitution will be allowed on the site. Gab gets 4.5M visits per month, according to SimilarWeb.
Minds - a free speech social network with a blockchain-based rewards system that was founded in February 2011, launched in alpha in 2012, and launched to the public in June 2015. According to SimilarWeb, it gets ~1.2M visits per month.
Parler - was founded in August 2018 and has already passed 1.5M users, according to its CEO John Matze, and receives 5.3M monthly visits, according to SimilarWeb. Parler's focus is on unbiased algorithms and free expression with its content moderation based on the US Federal Communications Commission (FCC) and Supreme Court decisions.
MeWe - a social network that focuses heavily on privacy and promises that there are no ads or spyware on the platform. It was founded in 2012 and launched publicly in 2016.