Proxyman.io - Proxyman is a high-performance macOS app, which enables developers to view HTTP/HTTPS requests from apps and domains.
Rage Grade by FullStory - Benchmark your customer frustration
RegExr - RegExr.com is an online tool to learn, build, and test Regular Expressions.
UXsniff - Track user behavior on your website and improve conversions with UXsniff: the user experience watchdog that looks out for you.
Regulex - Open-source, regular expression parser and visualizer.
UserBit - A full-stack qualitative research platform for UX & product teams.