learning
Ham Radio License Practice
Study current Technician, General, and Amateur Extra question pools in practice mode or take a realistic group-balanced exam.
Small tools / public experiments
Apps & Experiments
Useful, playful things I have made and kept around. They are free to use, require no account unless an app clearly says otherwise, and stay separate from my professional services.
Available now
Choose an app
Each entry links directly to a published app. Previews and tools requiring sign-in are labeled.
utility
Binary & Hex Playground
Convert binary, decimal and hexadecimal integers, toggle bits, and explore signed and unsigned bitwise operations.
learning
Linux Permissions Simulator
Explore rwx and octal modes, ownership classes, directory access and focused permission exercises.
learning
Linux Essentials Preview
Free Linux practice and timed draft quizzes. AI-authored questions are not human-vetted or endorsed by LPI. No sign-in required.
utility
IPv4 Subnet Calculator
Calculate subnet masks, network and broadcast addresses, and host ranges with explicit /31 and /32 semantics.
utility
DNS Record Explorer
Inspect public A, AAAA, CNAME, MX, NS and TXT answers, TTLs, and basic SPF and DMARC hints.
utility
Camping Inventory
Private gear inventory, checkout and packing plans. Sign-in required; access is restricted to authorized accounts.
Has any of this been useful?
These little tools are free to use. If one saved you some time or taught you something new, feel free to buy me a cold one!
Buy me a cold one!Optional support via Ko-fi · Opens an external site