What are some alternatives?
When comparing GestureWorks Gameplay and PlayOnLinux, you can also consider the following products
TouchMousePointer - TouchMousePointer is desktop application for Windows 8, Windows 8.1 or later.
Proton - Compatibility tool for Steam Play based on Wine and additional components
Padlet Briefcase - Padlet Briefcase provides a virtual canvas for team collaboration that can be used for venn diagram, discussion board or for a business plan
CrossOver - Don't buy a Windows license, don't reboot and don't use a Virtual Machine. Try a free trial of CrossOver to run your Windows software on Mac, Linux and Chrome OS.
Cheat Engine - Cheat Engine is an open source memory scanner/hex editor/debugger for Windows.
Wine - Open Source Software for running Windows applications on other operating systems.