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漢字の読みをrubyでマークアップしたり平仮名やカタカナへ変換
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文字変換・全角半角変換
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Password Generator | LastPass
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Username Generator | LastPass
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Unicode Chart
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The Missing Package Manager for macOS (or Linux) — Homebrew
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explainshell.com - match command-line arguments to their help text
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crontab.guru - the cron schedule expression editor
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TinyPNG - Compress PNG images while preserving transparency
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The best Favicon Generator (completely free) | Favicon.io
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Favicon Generator. For real.
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Remove Background from Image - remove.bg
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Javascript Viewer, Beautifier and Formatter, Editor
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JSFiddle - Code Playground
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CodePen: Build, Test, and Discover Front-end Code.
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HTML URL Encoding Reference
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HTML Codes Table
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CSS Formatter
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HTML Beautifier & Formatter
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HTML Entities Escape
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URL-encoder for SVG
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Free Online Whiteboard
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Online Development and Testing Tools
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diagrams.net
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YAML Lint
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URL Encode/Decode
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Base64 Encode/Decode
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Binary, ASCII, HEX, Decimal Converter
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HTML Color Codes
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Online Diff, Compare, and Merge checking tool
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JSON Formatter & Beautifier
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JSON Minifier
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MD5 Hash Generator
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XML Formatter & Beautifier
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Epoch Converter - Unix Timestamp Converter
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Online regex tester and debugger: PHP, PCRE, Python, Golang and JavaScript
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RegExr: Learn, Build, & Test RegEx
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IP Calculator / IP Subnetting
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Convert cURL command syntax to programming code
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PXtoEM.com: PX to EM conversion made simple.
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eBooks
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Get Emoji — All Emojis to Copy and Paste
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OpenMoji
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Ruby QuickRef
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Material Symbols and Icons - Google Fonts
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Material Design Icons
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JSONPlaceholder
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HTTP Toolkit
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Random User Generator