Dr. Link Check - Broken link checker with malware and parked domain detection
GetStream.io - APIs for the development of scalable newsfeeds and chat applications.
BrokenLinkCheck - Free Broken Link Checker / Online Dead Link Checking Tool - find bad hyperlinks
Geneva - An all-in-one communication app for groups & communities
LinkChecker - LinkChecker is a free, GPL licensed website validator.
müteme - A free Zoom mute button for Mac