Free developer toolkit

16 curated free tools for building, deploying, designing and learning. No sign-up, no tracking — just links that earn their place.

start

Slime Factory Tycoon 🟢 — Production-ready open-source Roblox idle tycoon & interactive web demo with pets engine, offline earnings & balance simulator.
Personal OP Agent — Zero-setup client-side AI workspace & prompt controller. Runs 100% in your browser.
Arena Audit Prompt Builder — Universal browser audit prompt generator for engineering, UX, security, and performance reviews.
Android APK Launch Hub — Quick launcher and download index for David's Android utilities and debloat tools.
VS Code — Gold-standard code editor with essential TypeScript, Git, and React extensions.
GitHub (LIN4CRE & DLinacre) — Version control, open-source portfolio hosting, Actions CI/CD, and release management.
Git — Fundamental CLI version control tool for tracking commits, branches, and releases.

React — Modern component-based UI library powering interactive browser tools and SPAs.
Vite — Lightning-fast dev server and frontend build tool with hot module replacement.
Tailwind CSS — Utility-first CSS framework for rapid responsive layouts and consistent styling.
Python — Versatile language used for backend services, automation scripts, and CLI toolchains.
Kotlin & Android SDK — Native Android development for utilities like Linacre Uninstaller and DKMA Monster.
Dexie / IndexedDB — Local-first browser database wrapper for fast offline storage without backend dependence.

Vercel — Global edge hosting platform with automated GitHub deployment previews and SSL.
GitHub Pages — Free static hosting directly from GitHub repositories for web guides and games.
Cloudflare — DNS management, edge workers, and CDN caching for domain performance.