FREEBIES:

• Font editor software
• Free Mock-Ups to Download
• Text Effects to Download
• Free Stock Photos:
  • Free botanical prints
  • MadeinMoments
  • Spashbase
  • The Stocks
  • Unsplash
  • more...
• Online tools:
  • BeeFree: Email Designer
  • Gravit (UI)
  • Handwriting font creator
  • Long Shadow Effect Generator
  • Mobile and web prototypes generator
• Textures and Patterns:
  • Lots of textures
  • Metallic
  • Basic textures
  • Pattern library

ILLUSTRATOR

• 101 Illustrator Tips & Tricks
• 70 Awesome tutorials
• Tutorials & Freebies

MISC:

• Color schemes
• UX Apprentice