[taffit]

Another unusual alternative could be the V-language [1], depending on if you consider this a "sane language" ;-). Not having used it myself and obviously you have to consider other arguments as well (community, developers, development activity, documentation etc.), but I was caught on all the features it promises, e. g. a "Native cross-platform GUI library": "V has a ui module that uses native GUI toolkits: WinAPI/GDI+ on Windows, Cocoa on macOS. On Linux custom drawing is used."

[1] https://vlang.io/