Developer Creates Open-Source Offline CTF Tracker for OSCP/CPTS Preparation with 1,005 HTB & THM Boxes

A developer created ZeroBox, an open-source CTF tracking tool that runs offline in the browser or as a desktop app, to consolidate their certification preparation workflow. The tool includes 1,005 HTB and THM machines, curated pathways for OSCP/CPTS/CRTO certifications, a dynamic cheatsheet with 130+ reverse shells, a loot vault for credentials and flags, and a 24-hour exam simulator. All data is stored locally in the browser's LocalStorage/IndexedDB with no backend, account requirement, or tracking, and includes one-click JSON backup functionality.