Omnipedia’s code is open source and licensed under the GPLv2 making it free and open source software (FOSS). We summarize our rationale for doing this on our open source page which also links to where you can find all the code.
I love talking about this stuff, but I’m unsure how many of you might find this interesting, so let me know if you’d like to learn more about how it all works under the proverbial hood.