Does PrintKey2000 work with Linux or Mac? How about the competitors Greenshot and Snagit?
No, PrintKey2000 doesn't work with Linux or Mac. There are no downloads for these platforms, but you can either use similar applications or one of the ones mentioned by you as well.
For example, Greenshot is for Windows only while Snagit can be installed on Mac as well in form of a trial.
An alternative would be Instantshot for Mac. I've tested the application and it works very well. Download it through the following website: