is for a company - if your goal is to share the technology as opposed to making money you should go with a . Donation run sites are rarely companies as their goal is not profit.
It won't come under org because it's only given to organizations like university, colleges, trust like that. SO your website will come under com as a business site.
Internet top-level domains, "com" and "org", are not strictly regulated for usage. You may choose either in this case, and common practice is to register with both.
