Best GUI toolkit?

inb4 "embed a web server so you can use webpages!"

Constraints:
- free as in beer
- must be beautiful by default, no Tk shit
- is or can be made to interop with SBCL
- static linking
- at least works on Windows

>>1

- must be beautiful by default, no Tk shit

Have you considered the possibility that something is very wrong with your 𝓐 𝓔 𝓢 𝓣 𝓗 𝓔 𝓣 𝓘 𝓒 𝓢? That maybe you should learn to perceive beauty as F O R M following F U N C T I O N instead of _{^{rounded corners}}?