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Firecracker

open source / Overall score: 5.0(leading)

Virtual machine monitor written in Rust that uses KVM to run workloads in lightweight microVMs, combining hardware-virtualization isolation with container-like startup and density. It ships a deliberately minimal guest device model - network, block I/O, timer, KVM clock, serial console and a partial keyboard - to shrink the memory footprint and attack surface, and jails its own process with cgroups and seccomp BPF. AWS built it to run Lambda and Fargate.

Openness

5 high confidence

5.0

license: Apache-2.0(OSI)
source: public(Rust 78.7%)
core features withheld: no

Firecracker is fully Apache-2.0 with public source and no gated core.

https://api.github.com/repos/firecracker-microvm/firecracker recorded 2026-08-13
Repo metadata - license spdx_id Apache-2.0, language Rust, default branch main, archived false, 36,040 stars, 2,556 forks, pushed_at 2026-08-13.
https://firecracker-microvm.github.io/ recorded 2026-09-29
Project site says "Firecracker is open-sourced under Apache License, version 2.0." and its open source VMM card reads "Build your own microVM infrastructure. Full control, Apache 2.0 licensed."
https://firecracker-microvm.github.io/ recorded 2026-09-29
Project site opens with "Firecracker is an open source virtualization technology that is purpose-built for creating and managing secure, multi-tenant container and function-based services." and links the GitHub repository.
https://firecracker-microvm.github.io/ recorded 2026-09-29
Project site separates the "Fully Managed" AWS Lambda MicroVMs service from the open source VMM, whose card reads "Build your own microVM infrastructure. Full control, Apache 2.0 licensed."; searched the body for enterprise and license key: none.
https://github.com/firecracker-microvm/firecracker recorded 2026-06-04
Apache-2.0 license; powers AWS Lambda and Fargate
https://raw.githubusercontent.com/firecracker-microvm/firecracker/main/README.md recorded 2026-08-13
"Firecracker is open sourced under Apache version 2.0." The whole VMM builds from the public tree - "git clone https://github.com/firecracker-microvm/firecracker ... tools/devtool build" - and the README names no enterprise edition, license key or feature held back for a paid tier. It also states Firecracker was developed at AWS to accelerate AWS Lambda and AWS Fargate, and has been integrated into Kata Containers and Flintlock.

Adoption

5 high confidence

5.0

Firecracker is the microVM engine behind AWS Lambda and Fargate, and is also embedded in Kata Containers, Flintlock and E2B. It ships as a binary from GitHub releases rather than a package on any registry, so adoption here is read from the scale of the platforms it powers rather than from a download count.

https://api.github.com/repos/firecracker-microvm/firecracker recorded 2026-08-13
36,040 stars, 2,556 forks - corroborating only, not the reading.
https://aws.amazon.com/blogs/aws/firecracker-lightweight-virtualization-for-serverless-computing/ recorded 2026-08-13
"Today, Lambda processes trillions of executions for hundreds of thousands of active customers every month", and AWS Fargate "now runs tens of millions of containers for AWS customers every week". Both figures are as stated at the 2018 launch post and still on the page.
https://github.com/firecracker-microvm/firecracker recorded 2026-06-04
developed at AWS; powers AWS Lambda and AWS Fargate; integrated into Kata Containers and Flintlock
https://raw.githubusercontent.com/firecracker-microvm/firecracker/main/README.md recorded 2026-08-13
"Firecracker was developed at Amazon Web Services to accelerate the speed and efficiency of services like AWS Lambda and AWS Fargate", and "Firecracker has also been integrated in container runtimes, for example Kata Containers and Flintlock."

Capability

5 high confidence

5.0

Firecracker combines hardware-virtualized isolation with container-like startup speed and density, and it is the microVM underneath AWS Lambda and Fargate and managed sandboxes such as E2B. That pairing of isolation strength, startup speed and proven scale is what the rest of the category is compared against.

https://aws.amazon.com/blogs/aws/firecracker-lightweight-virtualization-for-serverless-computing/ recorded 2026-09-29
AWS launch post states "You can launch a microVM in as little as 125 ms today" and that Firecracker "consumes about 5 MiB of memory per microVM", with Lambda processing "trillions of executions" monthly.
https://firecracker-microvm.github.io/ recorded 2026-09-29
Project site lists "Only 5 emulated devices. Minimal attack surface with KVM-based isolation." and "Create up to 150 microVMs per second per host." and "Pack thousands on a single server with built-in rate limiters."
https://firecracker-microvm.github.io/ recorded 2026-09-29
Project site says Firecracker "runs in user space and uses the Linux Kernel-based Virtual Machine (KVM) to create microVMs" and that each microVM is isolated by a companion "jailer" program as a second line of defense.
https://github.com/firecracker-microvm/firecracker recorded 2026-06-04
lightweight microVMs combining hardware virtualization security with container speed; minimal memory footprint/attack surface
https://raw.githubusercontent.com/firecracker-microvm/firecracker/main/README.md recorded 2026-08-13
The VMM "uses the Linux Kernel Virtual Machine (KVM) to create and run microVMs", excludes "unnecessary devices and guest-facing functionality to reduce the memory footprint and attack surface area", and targets "secure, multi-tenant container and function-based services". Language-agnostic at the kernel level rather than tied to a runtime.

Verified 2026-09-29, except some scores, still awaiting re-confirmation