Open Peeps - A hand-drawn illustration library.
TripleA - TripleA is a free (under GPL) turn based strategy game based on Axis & Allies board game.
Control Illustrations - 108 free flat illustrations with customizable characters
Domination - Domination is a game that is a bit like the well known board game of Risk.
DrawKit - MIT licensed SVG illustrations, in 2 styles
Ticket to Ride - Ticket to Ride is a Turn-based Strategy, Puzzle, Board, Co-op, Single, and Multiplayer video game created and published by Days of Wonder and Asmodee Digital.