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===VirtualBox=== [[VirtualBox]], first released in January 2007, used some of QEMU's virtual hardware devices, and had a built-in [[Dynamic recompilation|dynamic re-compiler]] based on QEMU. As with KQEMU, VirtualBox runs nearly all guest code natively on the host via the VMM (Virtual Machine Manager) and uses the re-compiler only as a fallback mechanism β for example, when guest code executes in [[real mode]].<ref name="LMJ9L3">{{cite web |title=VirtualBox Developer FAQ |url=http://virtualbox.org/wiki/Developer_FAQ |access-date=2015-02-02}}</ref> In addition, VirtualBox did a lot of code analysis and patching using a built-in disassembler to minimize recompilation. VirtualBox is free and open-source (available under [[GNU General Public License|GPL]]), except for certain features.
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