not only mac but bsd, and all linux distros.

This is just an idea, but I know it would work. Unlike a java -jar, you would not need a vre, as all code would operate natively and fast on the cpu as machine code. The code would be small and you would need only a small 1Kb program to handle the kilk. Thus everyone would klik and run the same klik, but within the klik, it would contain many different executables. Freebasic can compile both to linux and windows, and many languages are now being developed to be compiled natively on many systems. The trick is the language you use, should have a gui in the programming language you use. Thus, all programs would be pixel perfect on all systems.

For linux the script would extract the compressed file, in a local directory and run it.