SourceCode and Compiled Binaries for two low-level system information tools: NtSysInfo explores Windows internals and enumerates system processes, windows, threads, objects. The WhoUses utility allows you to determine what process has a file or DLL locked.
This handy little app provides all the features of PowerMenu, plus the file-dialog quick-menus that PowerDesk's Dialog Helper used to do, plus a whole pack of extras: minimize-to-floating icon, a virtual desktops plugin, etc, Seriously useful stuff.
Bochs is a highly portable open source x86 PC emulator ... capable of running most Operating Systems inside the emulation including Linux, DOS, and all versions of Windows... and the images are portable from one host OS to another.