there's also pubnix (public unix-like servers), gopher, and a new protocol called gemini (which adds simple links and viewer-owned formatting to to gopher). i think there's certainly something to the idea behind more restrictions, with just enough rather than plenty.
i almost want to give myself nothing but wikipedia, api docs, and “small web” and pubnix. i'm not sure that i can give up hn or its ilk (but the ratio of interesting content to poor content is terrible)