[dietrichepp]

The Internet Archive lets you run HyperCard stacks by emulating the entire Macintosh system, but you can also use the HyperCard Simulator:

https://hcsimulator.com/

You can click on a menu at the top right to bring up a list of stacks. It simulates HyperCard directly rather than simulating an entire Macintosh, so it’s a lot faster and more convenient to work with. Not all stacks are compatible, but there’s a wide selection.

[hyperhello]

To clarify, all stacks are compatible, including the built in color tools. If there’s an XCMD inside that has not been supported yet, the stack will still run otherwise.