Singularity is a web-based platform that allows people to play and create their own games. It provides an easy-to-use interface and powerful tools that allow users to quickly create, customize, and share their own games. It also provides access to a variety of different game types, including puzzle, strategy, arcade, and more. Singularity also features an extensive library of existing games, as well as access to a variety of game-making tutorials and resources. With its simple yet powerful tools, Singularity is a great way for players to explore their creativity and have fun.
Discontinued Nexuiz is no longer developed. Its successor is https://alternativeapp.info/software/xonotic/, but the latest version of Nexuiz Classic, 2.5.2, released in 2009, can still be downloaded from the official website.