• p.yusukekamiyamane - Free stock icons + pixel fonts → CC BY 3.0 windows-xp (skeuomorphic) like icons
• A.N. Lucas’s 88x31 button Collection → buttons (blinkies)
• Nuvola by David Vignoni (LGPL) for colorful icons (also used in the KeePass website/program)

• Public Work → public work photo searcher
• Soviet Textures → now defunct; categorised soviet textures from 1931-1982

See https://int10h.org/oldschool-pc-fonts/fontlist/ for oldschool fonts.

• Tahoma along with System-UI are good looking old fonts from Windows XP.
• Terminus is a really nice monospace bitmap font.

• https://www.photopea.com/ → online editor