IPFW
5.9#11 in server virtualization softwareFree planFree planSelf-hosted
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| Fact | IPFW | QEMU |
|---|---|---|
| Free plan | Yes | Yes |
| Purpose | ipfw is the user interface for controlling the FreeBSD firewall, dummynet traffic shaper and packet scheduler, and in-kernel NAT services. | QEMU is a generic and open source machine emulator and virtualizer. |
You want what its maker publishes above — check its page for the details.
QEMU suits users who need whole-machine emulation, cross-architecture process execution, or disk-image utilities. It is available across several platforms, with specific Windows and macOS requirements.