Dr. Link Check - Broken link checker with malware and parked domain detection
Twilio - Brings voice and messaging to your web and mobile applications.
BrokenLinkCheck - Free Broken Link Checker / Online Dead Link Checking Tool - find bad hyperlinks
Plivo - Plivo simplifies your customer engagement.
LinkChecker - LinkChecker is a free, GPL licensed website validator.
MessageBird - Reach 7 billion phones in seconds via SMS, Chat & Voice. Try it for free and improve your communication.