Open Source Packages
Libraries, frameworks, tools, and SDKs used by the apps in this directory — scored the same way as the apps themselves.
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validators
A Python library for validating strings — emails, URLs, IPs, and more — without defining a schema.
utf-8-validate
Native addon that validates UTF-8 buffers at C++ speed, with a pure-JS fallback for unsupported platforms.
cron-validator
A zero-dependency TypeScript library that validates cron expression strings, with support for seconds, aliases, blank days, and nth-weekday syntax.
composer/semver
PHP semantic version comparison, constraint parsing, and validation library from the Composer team
filetype
Fast, dependency-free Go library that detects file and MIME types from magic number signatures.
free-email-domains
A continuously updated JSON list of free and disposable email domains for filtering signups and scoring leads.
is
TypeScript-first runtime type checking with type guards, assertions, and generic-aware inference for over 100 JavaScript and TypeScript value types.
pathvalidate
A zero-dependency Python library that sanitizes and validates filenames, file paths, and LTSV labels across Windows, Linux, macOS, and POSIX platforms.
