Kusog is a Cebuano/Hiligaynon (Philippine local dialects) word which means vigor, strength, force or power when used as noun. It can also mean intense or full blast if used as an adjective.
While the Kusog.org site was started in 2011, the architecture and refinements that exist within it have been evolving over the last 12 years and used in various projects by its founder. The various code and architecture artifacts found on this site come from its strength of surviving and adapting through the years, and thus we feel the word Kusog is a good match for the site.
It doesnt hurt that Kusog is only 5 letters long and the domain name was available. 