Now UI Kit - A beautiful Bootstrap 4 UI kit. Yours free.
Startup Stash - A curated directory of 400 resources & tools for startups
Module 02: Layouts - Professional toolkit for UI/UX design
StartupResources.io - Tightly curated lists of the best startup tools
Startup Toolkit - Interactive how-to guides to launch your startup
Startup Collections - Resources & tools for entrepreneurs, designers & developers