PostHog - Open source product analytics on your infrastructure.
Startup Toolkit - Interactive how-to guides to launch your startup
Pythia World - Pythia is an analytical platform for startup founders
HVAC Toolkit - HVAC ToolKit is an easy-to-use app to assist engineers.
Maze - Beautiful & actionable analytics for InVision prototypes
IT Tools - IT Tools is a free and open-source collection of handy online tools for developers & people working in IT.