Toole - Search for and discover online tools
Really Good UX - A library of screenshots for UX inspiration
Uxcel - The easiest way to learn UX/UI design
UX Check - Easy heuristic evaluations on your website (chrome ext.)
UXsniff - Track user behavior on your website and improve conversions with UXsniff: the user experience watchdog that looks out for you.
Heurix.io - Heurix is a free heuristic evaluation tool that helps you work out how to improve your website.