Startup Stash - A curated directory of 400 resources & tools for startups
StartupResources.io - Tightly curated lists of the best startup tools
ProppyJS - Functional props composition for UI components (React & Vue)
Founded X Startup Stats - Find the best country to build your startup in
Devhints - TL;DR for developer documentation
ueCalc - Simple tool for finding bottleneck and optimal metrics value