Here is an attempt to list out some super-useful but not-so-popular websites which offer images, vectors, videos, music, templates etc for FREE with personal & commercial use license.
Sometimes attributions are required. Make sure to check the license terms.
FREE Images/Photos & More
- Pexels - FREE Images & Videos
- Mixkit - FREE Images, Videos, Templates & Music
- Pikwizard - FREE Images & Videos
- FOCA - FREE Images, Videos & Templates
- Stockvault - FREE Images, Vectors, Brushes & Templates
- Freedesignlife - FREE Images, Vectors, Brushes, PSDs, Icons & Fonts
- Picspree - FREE Images & Vectors
- Wingart Studio - FREE (Selected) Graphics & Templates Every Month
- picryl - FREE Images, Illustrations, Videos, Music, Documents etc
- USFWS National Digital Library - FREE Images, Illustrations, Videos, Audio, Maps etc
- Clip Art Blog - FREE Clip Art & Images
FREE Images/Photos Only
- Unsplash - FREE Images
- Reshot - FREE Images
- Freephotos - FREE Images
- Freestocks - FREE Images
- Altphotos - FREE Images
- nappy - FREE Images
- slon.pics - FREE Images
- My Stock Photos - FREE Images
- Shutteroo - FREE Images
- Trunklog - FREE Images
- Skitterphoto - FREE Images
- Picography - FREE Images
- Burst - FREE Images
- Pic Melon - FREE Images
- My Photo Pack - FREE Images
- Vladmir's Collection - FREE Images
- Free Nature Stock - FREE Images
- Travel Coffee Book - FREE Images
- Skuak - FREE Images
- Stokpic - FREE Images
- Freely Photos - FREE Images
- Wunderstock - FREE Images
- Moveast - FREE Images
- Free Food Photos - FREE Images of Food
- unprofound - FREE Images
- Albumarium - FREE Images
- Pic Pac - FREE Images (pay what you want)
- iwaria - FREE Images from Africa
- Creativity103 - FREE Abstract Images & Textures
- Focus Fitness - FREE Fitness Images
- Free Vintage Illustrations - FREE Illustrations from Past
- Old Book Illustrations - FREE Illustrations from Past
- Reusable Art - FREE Old Artwork
- lowpolygonart - FREE Low Polygon Art
- Streamline Icons - FREE PNG Icons
- Cosmos - FREE PSD Icons
- marysrosaries - FREE Images (Religious)
- Irish Clip Art Archive - FREE Clipart (Raster)
- Dictionary Images -FREE Public Domain Images and Illustrations from Dictionary
- Logo Design Web - FREE Public Domain Images
- PDClipart - FREE Clipart (Raster)
- Antique Clipart - FREE Antique Clipart (Raster)
- WPClipart - FREE Images & Clipart
FREE Vectors Only
- Open Peeps - FREE Hand-drawn Vector Library
- Isometric - FREE Isometric Vectors
- Illustrations - FREE Kit with 100 Vectors
- DrawKit - FREE Vectors
- unDraw - FREE Vectors
- Lukaszadam - FREE Vectors
- Open Doodles - FREE Vectors
- Woobro - FREE Vectors
- Free Vector - FREE Vectors
- Glaze - FREE Vectors
- manypixels - FREE Vectors
- Free Vector Maps - FREE Vectors
- Fresh Folk - FREE Vector Library with People & Objects Illustrations
- Humaaans - FREE Vector Library with People Illustrations
- Openclipart - FREE Vector Cliparts
- FREESVG - FREE Vectors
- SVG SILH - FREE Vector Icons
- SVG Repo - FREE Vectors
- Peechey - FREE Vectors
- Desket - FREE Random Vector Icons
- Sketch App Resources - FREE Sketch Resources
- Nicu's Clipart Collection - FREE Vectors
- ikonate - FREE Customizable Vector Icons
FREE Mockups, Placeholders, Icons etc
- uiprint - FREE Printable Wireframes, Mockup and Sketchpads
- uilogos - FREE Logo Placeholders
- iconmonstr - FREE Icons
- lstore graphics - FREE Mockups
- Mockup Club - FREE Mockups
- Thread - FREE 3D Mockups Generator
- 365psd - FREE PSDs
- Creative Tim - FREE Web Templates & Themes
- Email Monster - FREE Email Templates
- Design DB - FREE Templates
- FREE One Page Web Templates
- UIUX Repo - FREE UI and graphic design resources for Photoshop, Sketch, Adobe Xd and Figma
FREE Videos Only
- Mazwai - FREE Videos
- Coverr - FREE Videos
- Distill - FREE Videos
- Life of Vids - FREE Videos
- Vids Play - FREE Videos
- Dareful - FREE Videos
- Clipstill - FREE Cinemagraphs
- Motion Elements - FREE Stock Footage
FREE Music & Sound FX
- Free Music Archive - FREE Music
- Incomptech - FREE Music
- m-operator - FREE Music
- Purple Planet - FREE Music
- Free Stock Music - FREE Music
- Fesliyan Studios - FREE Music & Sound Effects
- The Motion Monkey - FREE 300 Retro Game Sound Effects
- Free SFX - FREE Sound Effects
FREE Fonts Only
- League of Movable Type - FREE Fonts
- Font Library - FREE Fonts
- FONT Repo - FREE Fonts
Also, check these threads: