PS/Tk for Chicken Scheme [0] would be my serious recommendation. There is STklos [1], which is a R5RS Scheme with Tk embedded into it, as well as GTK+ for when

PS/Tk for Chicken Scheme [0] would be my serious recommendation. There is STklos [1], which is a R5RS Scheme with Tk embedded into it, as well as GTK+ for when you feel the need. It is actively developed. (Started out in life as Scheme Tk). [0] https://wiki.call-cc.org/eggref/4/pstk https://wiki.call-cc.org/eggref/4/pstk [1] http://www.stklos.net/ http://www.stklos.net/