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
CSS selector library in Go
WebLoop: Scriptable, headless WebKit with a Go API. Like PhantomJS, but for Go.
Decodes url.Values into Go value(s) and Encodes Go value(s) into url.Values. Dual Array and Full map support.