Figma - Team-based interface design, Figma lets you collaborate on designs in real time.
Tanglet - Tanglet is a single player word finding game based on Boggle.
Invision - Prototyping and collaboration for design teams
Lexica - An open source word-search game.
Sketch - Professional digital design for Mac.
Wordbase - Wordbase - the fun, addictive and challenging game of words and letters for iPhone!