With the new TLD program which started in 2014, over 1200 extensions have been created. The nTLDs category of new domain name extensions are composed of three groups:
The NgTLD market is by far the largest. On the contrary to corpTLD and geoTLD markets, its registries are for profit organisms, typically internet companies or institutions specialized in a specific topic or sector. They usually manage one nTLD, sometimes a few.
https://observatory.domains/ - Observatoire des nTLD, par Comlaude
The gTLD Club : A blog about New gTLDs and dotBrands (.BRANDs) from the ICANN new gTLD program, by Jean Guillon
https://www.gtld.report/ - Statistiques et comparaisons sur les nTLD (infos basées sur ntldstats.com), par Jean Guillon