validator.w3.org
Markup Validation Service helps clean, compare, sort, transform, count, or format text in the browser.
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validnumber.com
Phone validation service for checking number format, country, carrier, and line type information.
fakenamegenerator.com
Generates test credit card numbers used for payment form testing and software development.
hunter.io
Hunter tool for verifying if an email address is valid, deliverable, and safe to use before outreach.
gitlab.com
Machine Learning library for PHP. Algorithms, Cross Validation, Neural Network, Preprocessing, Feature Extraction and much more in one library.
trumail.io
Open source email verification service for checking syntax, MX records, and deliverability through an API.