Everything in the catalog

Minimal web app for assembling text prompts from selectable options.

Converts optical flow (.flo) files into images and can compile them into a video.

Dice-command roller supporting many tabletop RPG systems, popular in Japan; its site has an online roller.

Pathfinder RPG online character sheet that auto-calculates many scores and bonuses.

Extracts text and tables from PDF files and exports them as Markdown, JSON, Word or Excel.

Bytebeat player with a collection of formulas from around the web, where music comes from one-line math code.

Browser game that listens to your real guitar to practice finding notes on any string.

Synthesizes Verilog or SystemVerilog and simulates the resulting digital circuit graphically.

Demo page for the totp.js library that generates TOTP codes in the browser.

Interactive visual music theory pages with playable sound examples.

Nonogram puzzle (also called hanjie or picross) with generated boards and touch-friendly controls.

Shows any text you type in large letters across the full screen, for signage or display use.

Minimalistic web app for creating electronic music with a step sequencer and synth.

Installs Tasmota firmware on ESP devices from the browser.

Generates QR codes for two-factor authentication setup from your own secret details.

Web environment for reading and analysing texts, with frequencies, trends and visualizations.

Suite of tools for Pathfinder 2e players and game masters, including rules and bestiary lookup.

Converts Clash client outbound proxy settings into the sing-box format.

Mobile-ready online Markdown editor that imports and exports local files.

Open-source mahjong solitaire: remove matching free tiles until the layout is cleared.

Chiptune-style tracker for composing retro music, with an online version.

Generates short, memorable passwords in the browser.

Generates a linearly scaling font-size using CSS clamp().

Suggests next guesses by filtering the answer list against the colors you got from the official Wordle.