JOSE is a comprehensive set of JWT, JWS, and JWE libraries.
The only other JWS/JWE/JWT implementations are specific to JWT, and none were particularly pleasant to work with.
These libraries should provide an easy, straightforward way to securely create, parse, and validate JWS, JWE, and JWTs.
JWE is currently unimplemented.
The docs can be found at godoc.org, as usual.
A gopkg.in mirror can be found at https://gopkg.in/jose.v1, thanks to @zia-newversion. (For context, see issue #30.)