DOSBox is an emulator program which emulates an IBM PC compatible computer running a DOS operating system. Many IBM PC compatible graphics and sound cards are also emulated.
LeoCAD is a CAD program for creating virtual LEGO models. It has an easy to use interface and currently includes over 6000 different pieces created by the LDraw community.
Currently optimized for ARM Chromebooks, ExaGear Windows Emulator allows you to run full-function versions of Windows PC applications directly on Chromebooks and ARM-based Android devices with a connected keyboard and mouse.