Online Tools

1. Sakura Of America
2. picjumbo — totally free photos & stock images
3. MyGov.in | MyGov: A Platform for Citizen Engagement towards Good Governance in India
4. Grid Image Checker Tool: Facebook 20% Text Rule
5. Font Awesome Cheatsheet

To be researched

1. Keyboard Shortcuts for Sketch App
2. UpLabs
3. Free vector icons - SVG, PSD, PNG, EPS & Icon Font - Thousands of Free Icons
4. PNG photo images free clipart download
5. Premium and Free Logo Mockups, Text Effects, Templates and More!
6. Download Mockplus | Rapid and Simple Prototyping Tool
7. 3 more

To make your work look classy and sexy

1. Mockup and print file generator
2. Free iPhone Mockup Generator & App Demo Videos by Placeit
3. 10 Easy & Quick Online Mockup Tools That Help You Imagine Anything