https://www.rockpapershotgun.com/2017/09/22/ex-valve-chap-launches-half-life-mod-c-a-g-e-d/
Founded in 2004, Leakfree.org became one of the first online communities dedicated to Valve’s Source engine development. It is more famously known for the formation of Black Mesa: Source under the 'Leakfree Modification Team' handle in September 2004.