Tools On TheSpielplatz

A diy paper frame generate and print layout.

This tool creates paint by number pixel drawing which can be printed and used to occupy children 😉.

A free and open source collection of tools from my daily work life, that I improved by coding them myself.

An OpenID Connect provider that bridges LNURL-auth, letting users sign in with their Lightning wallet through any OIDC client (e.g. Logto) by signing a cryptographic challenge instead of using a password.

Lerne und übe die Blackjack Basis-Strategie interaktiv mit sofortigem Feedback, um deine Entscheidungen am Tisch zu perfektionieren.

This tool lets you drag and drop an .ics calendar file to instantly view the event details like title, time, location, and description. With one click, you can add the event to your Google Calendar using a pre-filled link — no login or installation required.

Upload an image, add date, location, and description, then download a polaroid-style photo.

Generate SEPA-compatible banking QR codes instantly by entering recipient, IBAN, BIC, and amount details. Easily scannable with most European banking apps for fast and error-free payments.

This tool validates a Austrian social security numbers to ensure accuracy and compliance with local regulations.

You're a Bitcoiner — they're not. Yet. Set up a read-only piggy bank for each of them, link their LNBits wallet, and let them watch their sats grow.

Creates from a mnemonic (BIP39) printable sheet for backup card, cover sheet, zpub and addresses

This is a live Linux system that loads completely into RAM, enabling the removal of the USB drive. This approach guarantees that no data, intentionally or accidentally, is saved.

Design 2D pixel images visually and send them directly to WLED. A lightweight studio for pixel art, live previews and device control.

Enhancement of a phase control board by integrating it with an ESP32 microcontroller, enabling control through a web interface.

Use an LNBits account to easily make a donation barometer.