WebGazer - Monitor your website's availability with WebGazer, review its performance and get instant notifications when your website goes down. No installation required and free plan available.
Webvizio - This free website feedback tool & website review software allows managers and teams to collaborate on website revisions in real time. Join for free now!
Hyperping - Cheap uptime and performance monitoring with detailed reporting and flexible alerting
Collaboration Toolkit by Mailjet - Think Google Docs for email template creation 💌
NIXStats - SaaS monitoring tool for window/linux servers and websites. Think up-time robot but with more features.
DebugTool - A single screen that let you see what needs to be fixed quickly and easily in your webdesign.