There is a new Top-Level Domain (TLD) extension, .Monster, that was recently launched by XYZ.com LLC ("XYZ"). Currently, the .Monster domain is in the sunrise phase. The sunrise phase is the launch period, February 18th to March 20, 2019, that is reserved for registration by trademark holders. After sunrise, the domain extension then enters the Early Access Period (EAP), March 21st to March 28, 2019. The EAP is a phase for priority registrations; meaning, you will pay a significantly higher price for the early registration of a .Monster domain.
The new general, Top-Level Domain (gTLD), .Dev, is a domain extension for those who want a developer- or technology-related domain name. Google owns the .Dev gTLD, and domain names can be registered with that extension on Google Domains and at other domain registrars.