ColorSpace - Color Palettes Generator and Color Gradient Tool

Design
Color Hunt - Color Palettes for Designers and Artists
Canva
Search projects | Photos, videos, logos, illustrations and branding on Behance
Mockup World
Mockups Design
Awwwards - Website Awards - Best Web Design Trends
Relearn CSS layout
Picular
Figma: the collaborative interface design tool.
2200+ free vector icons - Unicons by Iconscout
cmiscm/leonsans
chrismsimpson/Metropolis
Mokup - Mokup
ProtoPie