CxOS — Real hacker tools. Zero install. Sealed sandbox. Free.

CxOS is a Linux 6.11 build with the canonical white-hat toolchain — nmap, gdb, radare2, john, hashcat, python3 + scapy + cryptography, openssl, gnupg — booted inside your browser tab. No VM, no install, nothing to break. The whole environment is sandboxed inside the page; nothing leaves your machine and you can't accidentally point a tool at the live internet.

If any of these sound like you, you'll get a lot out of it

• You tried installing Kali in VirtualBox and gave up.
• Your laptop is a school or work machine where you can't install software.
• You're studying for Security+, CEH, OSCP, or a college cybersecurity track.
• You're on TryHackMe / HackTheBox and want somewhere to noodle that doesn't burn a session.
• You're a CTF player picking up a new tool.
• You're a parent or teacher introducing real Linux + security tools safely.

What's in the box

Recon: nmap, ncat, tcpdump. Reverse engineering: gdb (with TUI), radare2, xxd, hexdump. Cracking: john the Ripper, hashcat. Cryptography: openssl, gnupg, libsodium. Scripting: python3 + pip, scapy, cryptography, requests. Hardware: libgpiod, i2c-tools, spi-tools, kernel GPIO chardev / I²C / SPI / loadable modules. Shell & userland: bash, zsh, tmux, vim, nano, git, curl, jq. Build: gcc, g++, make, binutils (objdump, readelf, strings).

How it works

Built from scratch with Buildroot for the i486 architecture so it boots inside the v86 JavaScript x86 emulator. Sealed: no real network device, no filesystem access, nothing survives the tab closing. Works offline after the first ~30-second download. Free, no account required.

Open CxOS now → · Start the guided lessons · Hacking tool tutorials