A little like that j-thing, only in Go.
Go minifiers for web formats
bluemonday: a fast golang HTML sanitizer (inspired by the OWASP Java HTML Sanitizer) to scrub user generated content of XSS
CSS selector library in Go
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.