Dev tools · alternatives · 2026

24 alternatives to Z-Jail – A 130 KB Linux sandbox-C99 with 7 defense layers and zero deps

A lightweight, multi-layer Linux sandbox combining namespaces, pivot_root, seccomp-bpf, capability dropping, and an evidence-based verdict engine (Truthimatics Public Version) for secure, auditable code execution. - Division-36/Z-Jail

Z-Jail is a lightweight Linux sandbox written in C99 that weighs 130 KB and requires no external dependencies. It provides seven layers of defense to isolate and contain processes. The tool is designed for developers… Below are 24 products that do a similar job, ranked by how close each is in meaning and then by launch-day votes.

1
Tiny VM sandbox in C with apps in Rust, C and Zig▲196
Minimalist, dependency-free virtual machine sandbox for microcontrollers and other resource-constrained devices. Single C file, no dynamic memory allocations, asynchronous design, pure C99 - ringtailsoftware/uvm32
Dec 2025 · github.com · its alternatives →
2
Warp, a Rust-based terminal▲946
Hi HN community, I’m Zach, founder and CEO of Warp, and am excited to show you Warp, a fast Rust-based terminal that’s easy to use and built for teams. As of today, Warp is in public beta and any Mac user can download it. It works with bash, zsh, and fish. The terminal’s teletype-like interface has made it hard for the CLI to thrive. After 20 years of programming, I still find it hard to copy a command’s output; I always forget how to use `tar`; and I always have to relearn how to move my cursor. To fix fundamental accessibility issues, I believe we need to start innovating on the terminal,…
2022 · warp.dev · its alternatives →
3
Zerobox – Sandbox any command with file, network, credential controls▲141
I'm excited to introduce Zerobox, a cross-platform, single binary process sandboxing CLI written in Rust. It uses the sandboxing crates from the OpenAI Codex repo and adds additional functionalities like secret injection, SDK, etc. Watch the demo: https://www.youtube.com/watch?v=wZiPm9BOPCg Zerobox follows the same sandboxing policy as Deno which is deny by default. The only operation that the command can run is reading files, all writes and network I/O are blocked by default. No VMs, no Docker, no remote servers. Want to block reads to /etc? zerobox…
Mar 2026 · github.com · its alternatives →
4
Jetpack, a FreeBSD Jail/ZFS-based container runtime▲96
**PROTOTYPE** FreeBSD Jail/ZFS based implementation of the Application Container Specification - 3ofcoins/jetpack
2015 · github.com · its alternatives →
5
Drop – a rootless Linux sandbox with gVisor support▲193
Drop: a rootless Linux sandbox for developers. It isolates coding agents and third-party packages while preserving your work environment.
Sep 2026 · droprun.sh · its alternatives →
6
dif.sh▲373
Markdown feature flags your coding agent installs for you
Aug 2026 · dif.sh · its alternatives →
7
A “living” Linux process with no memory▲312
A "living" Linux process with no memory. Contribute to izabera/zeromaps development by creating an account on GitHub.
2020 · github.com · its alternatives →
8
Lightweight tool for managing Linux virtual machines▲144
hey guys. the other day i was migrating hosting providers and i just needed something not too heavy and convenient to spin up my backups for awhile and realised there is almost nothing out there. kimchi hasn't been updated for years and cockpit is heavy. so here's something i came up with in a couple hours because of a sudden urge, nothing fancy just basic creation with cloud init, lifecycle management and image/storage, but it's modern-ish and it compiles to a 8.4mb binary inclusive of the embedded web UI, CLI and API, and only dep is libvirt.
2025 · github.com · its alternatives →
9
Kern – container and resource runtime in a 1.5 MB binary, no daemon▲70
A fast, rootless sandbox and virtual resource runtime for any workload, including untrusted and AI-generated code. Daemonless: a real, kernel-enforced container in ~3.5 ms from an OCI image, out of one static binary - getkern/kern
Aug 2026 · github.com · its alternatives →
10
Lockdown.sh Simple shell script for locking down new linux installs▲51
Lockdown your linux install. The simple zero config linux hardening script - dolegi/lockdown.sh
2020 · github.com · its alternatives →
11
A proof-of-concept FoundationDB based network block device backend▲192
A totally proof-of-concept FoundationDB based network block device backend - dividuum/fdb-nbd
2018 · github.com · its alternatives →
12
YepCode▲157
Hey HN, We’re excited to introduce YepCode Run, a serverless runtime and SDK for executing code in secure sandboxes. Built on top of YepCode (https://yepcode.io), it allows you to execute code without any setup or installation. Perfect for: * Running AI-generated code – Securely in a sandbox environment, enabling fully autonomous AI agents. * Package Exploration – Try npm or PyPI packages without installing them locally. * Code Sharing – Easily share runnable code examples with others. * Quick Prototyping – Test snippets and algorithms on the fly. Just write or paste your code, and…
2022 · yepcode.io · its alternatives →
13
Sandy – A tiny Sandbox to run untrusted code ️▲64
A tiny "sandbox" to run untrusted code 🏖️. Contribute to craigmulligan/sandy development by creating an account on GitHub.
2020 · github.com · its alternatives →
14
Nucleus – A security-hardened, Nix-native container runtime▲40
Hi HN, I've been building Nucleus, a lightweight Linux container runtime focused on two workloads: ephemeral AI-agent sandboxes and declarative NixOS services. It's a single Rust binary, no daemon. It is not a Docker replacement and not a strict subset of Docker either. I dropped the entire image-and-distribution half (no Dockerfile, no layers, no registry, no pull/push, no persistent storage layer) in exchange for going deeper on isolation and reproducibility. The rootfs is either a directory copied into tmpfs (agent mode) or a Nix-built closure mounted read-only (production mode). If…
Jun 2026 · github.com · its alternatives →
15
Hydrogen, a multithread non-blocking Linux server framework in Rust▲154
Multithreaded, non-blocking Linux server framework in Rust - nathansizemore/hydrogen
2016 · github.com · its alternatives →
16
I wrote an OS in 1000 lines of Zig▲151
A minimal RISC-V 32-bit OS written in Zig. Contribute to botirkhaltaev/pico-os development by creating an account on GitHub.
2025 · github.com · its alternatives →
17
ZeroDB▲119
An open-source, end-to-end encrypted database protocol
2015 · zerodb.io · its alternatives →
18
Differential Fuzzing of Cryptographic Libraries▲84
Cryptofuzz Cryptofuzz is a project that fuzzes cryptographic libraries and compares their output in order to find implementation discrepancies. It’s quite effective and has already found a lo…
2019 · guidovranken.com · its alternatives →
19
go-nbd – A Pure Go NBD Server and Client▲113
Hey HN! I just released go-nbd, a lightweight Go library for effortlessly creating NBD servers and clients. Its a neat tool for creating custom Linux block devices with arbitrary backends, such as a file, byte slice or what I'm planning to use it for, a tape drive. While there are a few partially abandoned projects like this out there already, this library tries to be as maintainable as possible by only implementing the most recent handshake revision and baseline functionality for both the client and the server, while still having enough support to be useful. I'd love to get your feedback :)
2023 · github.com · its alternatives →
20GA
Grsh – A high-performance shell for FreeBSD written in Rust▲50
I built GRSH because I wanted a modern, memory-safe shell that feels native to FreeBSD but works seamlessly on macOS. While there are many shells out there, GRSH is my take on a minimal, fast, and secure command interpreter written entirely in Rust. It's designed for users who want the safety guarantees of Rust without the overhead of more bloated alternatives. I'm currently working on the official FreeBSD port. I’d love to get feedback on the shell's behavior and performance from the community. Github: https://github.com/antoniomalara301289/grsh
Jan 2026 · grimreaper.icu · its alternatives →
21
Vekos – a Rust OS with Built-In Cryptographic Verification▲82
VEKOS(Verified Experimental Kernel OS) is a Rust-based experimental kernel that focuses on runtime verification and security. Every filesystem operation and memory allocation generates cryptographic proofs that can be verified in real-time, ensuring system integrity. Think of it like a blockchain for OS operations rather than just storage verification. Key features: - Merkle tree-backed filesystem with operation verification - Memory manager with CoW and proof generation - Buddy allocator with zone-based memory management - Shell with VT100 support - Verified boot sequence with stage…
2024 · github.com · its alternatives →
22
Z shell configuration, zsh startup files, when they load, what they do▲85
zsh configuration. Contribute to SixArm/zsh-config development by creating an account on GitHub.
2019 · github.com · its alternatives →
23
Salt – a systems language with Z3 theorem proving in the compiler▲44
Hey HN, I wanted to share the new online playground for Salt (https://salt-lang.dev/playground/), a sovereign systems language designed for high-performance, distributed workloads where paying an "abstraction tax" is no longer acceptable. We started building Salt to bridge the gap between the raw power of manual pointer arithmetic and the safety guarantees of modern high-level languages. The architecture relies on an MLIR-based backbone and a Z3-powered "formal shadow," and the design is rooted in three main pillars: Fast Enough: The target is to stay within 20% of C's…
Jul 2026 · salt-lang.dev · its alternatives →
24
Jail-Testing How Internet Chemotherapy Works▲37
Want to see how something like Internet Chemotherapy works without bricking your own vms? This is a jail to reduce the python runtime from doing bad things on the host when running untrusted code. Nerf what you do not need :space_invader: + :bug: :soccer: :football: :whale: - GitHub - jay-johnson/ne
2018 · github.com · its alternatives →

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