Verifalia REST API - Javascript SDK and helper library, for Node.js and the browser: verify email addresses in real-time and check whether they are deliverable, invalid, or otherwise risky.

Verifalia SDK for Node.js - OBSOLETE, please use https://github.com/verifalia/verifalia-js-sdk

Сlass data verifier. Utility validates InterSystems IRIS classes properties data according the properties type

Ruby gem to verify data