Bochs emulates the Hardware components of a computer. The Software simulates the processor, hard drive, memory, and peripheral devices, so that on such a virtual machine, install operating systems and test. In this way, you have the possibility of unstable systems or Software in a closed environment to try out without the Hardware of your computer is exposed to a hazard.Bochs makes all components of a PC entirely in Software.
Unlike the competition, the majority of machine language instructions directly on the host-CPU executes, forms Bochs each x86-command complex via several Software commands. This runs Bochs is slower than VMware and Virtual PC, but it is free and is located in the source code. A command-line Frontend helps when Setting up, but it is not very clear. To a new application, sure, in a working system separate environment to test, it is sufficient but all.
Bochs screenshots
You can free download Bochs 32, 64 bit and safe install the latest trial or new full version for Windows 10 from the official site.