A little like that j-thing, only in Go.
bluemonday: a fast golang HTML sanitizer (inspired by the OWASP Java HTML Sanitizer) to scrub user generated content of XSS
Go minifiers for web formats
Decodes url.Values into Go value(s) and Encodes Go value(s) into url.Values. Dual Array and Full map support.
WebLoop: Scriptable, headless WebKit with a Go API. Like PhantomJS, but for Go.
CSS selector library in Go