實用工具

Excalidraw
Excalidraw is a whiteboard tool that lets you easily sketch diagrams that have a hand-drawn feel to them.
Carbon
Carbon is the easiest way to create and share beautiful images of your source code.
Crontab.guru - The cron schedule expression editor
An easy to use editor for crontab schedules.
CIDR.xyz
Interactive IP address and CIDR range visualizer
regex101: build, test, and debug regex
Regular expression tester with syntax highlighting, explanation, cheat sheet for PHP/PCRE, Python, GO, JavaScript, Java, C#/.NET, Rust.
cheat.sh/:firstpage
JWT.IO
JSON Web Tokens are an open, industry standard RFC 7519 method for representing claims securely between two parties.
Convert curl commands to code
Utility for converting cURL commands to code
JSON to Go Struct
An online playground to convert JSON to Go Struct