I usually do it myself from scratch. This is partly because I like to learn all the details of how something works, but also because I have a perverse habit of

I usually do it myself from scratch. This is partly because I like to learn all the details of how something works, but also because I have a perverse habit of putting emulators of large machines unto microcontrollers, and most existing emulators are not targeted to a world with only a few K of RAM and limited cycles. eg: http://dmitry.gr/?r=05.Projects&proj=33.%20LinuxCard http://dmitry.gr/?r=05.Projects&proj=33.%20LinuxCard http://dmitry.gr/?r=05.Projects&proj=25.%20VMU%20Hacking http://dmitry.gr/?r=05.Projects&proj=25.%20VMU%20Hacking